In a statement on the club's website, Peacock says: "Although my family don't quite understand it, this feels like the right decision. The time has come for me to put my boots on again.
"Physically, it may take me some time to get back up to speed, but I've been preparing as best I can and mentally I'm in a good place."
Peacock, a multiple Super League, Challenge Cup and World Club Challenge winner who was crowned Man of Steel in 2003, could make his return against London Broncos on Sunday.
Ex-England captain Peacock out of retirement to play for Hull KR
Former England captain Jamie Peacock is coming out of retirement to play for Hull KR for the rest of the season, he has announced.
PACopyright: PA
Peacock, now 38, hung up his boots after helping Leeds to victory in last October's Grand Final and took up the role of head of rugby with the Robins.
However, the Robins are fighting for their Super League survival and Peacock aims to help them through a late-season injury crisis.
Tennis: Kyle Edmund names in Davis Cup team
Matt Dean
BBC Radio Humberside
Kyle Edmund has been named in the Davis Cup team to face Argentina in the semi final later this month.
Andy Murray, Dan Evans, Jamie Murray and Dom Inglot have also been selected, with Evans chosen ahead of James Ward. Liam Broady will also be travelling as part of the team.
Live Reporting
All times stated are UK
Get involved
- Water doesn't necessarily freeze at freezing point. Here's Keeley with the science bit
- Once you take your boots off you can always put them on again
- Rio must have a sky high electricity bill, they keep all the lights on
- Continental air from North Africa is making us sweat and Hull the hotspot of the UK
- A new manager could be on the horizon
BBCCopyright: BBC View more on twitterView more on twitter View more on twitterView more on twitter - MPs in our area who responded to a BBC survey, say they've received death threats
- An investigation has been launched after two people were found dead at a house near Grimsby
- Great Britain captain Jamie Peacock is coming out of retirement to play for Hull Kingston Rovers
Mary ArnoldCopyright: Mary Arnold View more on twitterView more on twitter View more on twitterView more on twitter View more on twitterView more on twitter Getty ImagesCopyright: Getty Images BBCCopyright: BBC - An investigation has been launched by police after a man and woman were found dead in a house near Grimsby
- Police say a 37-year-old man is continuing to be questioned following a firearms incident in Immingham last night
- Former Great Britain captain Jamie Peacock is coming out of retirement to play for Hull Kingston Rovers
PACopyright: PA View more on twitterView more on twitter BBCCopyright: BBC - Two people have been found dead at a house in New Waltham near Grimsby
- MPs across the region say they've received death threats at work in the past year
- A grant scheme has been launched to help regenerate businesses in Hull's Old Town
Latest PostGoodbye: Five things we learned today
Kimberley Metcalfe
BBC Local Live, Hull and East Yorkshire
Thanks for joining me today on the live feed for East Yorkshire and Humber. We'll be back tomorrow morning from 0800.
To round off the day lets take a look at five things we didn't know when we got up this morning.
Leisure centre revamp to go ahead
Work on extending a leisure centre in Hull is to begin in October, the council confirms.
Read moreComing up on Look North tonight
BBC Look North
East Yorkshire and Lincolnshire
Join Peter Levy from 18:30 on BBC One with all the latest news.
Traffic and travel: Update on overhead line damage at Retford
Here's a update from Virgin Trains regarding problems between Retford and Doncaster.
It's also having a knock-on effect for Hull trains.
Your headlines this evening
Gill Sennett
BBC Local Live, East Yorkshire and Humber
Here are your latest headlines for East Yorkshire & Humber:
Your pictures: A view across the estuary
Kimberley Metcalfe
BBC Local Live, Hull and East Yorkshire
This photo has been sent in by Mary Arnold, a view of East Yorkshire over the wheat fields of North Lincolnshire.
If you have any photos you'd like to share you can send them to me here.
It's getting hot in here
Kimberley Metcalfe
BBC Local Live, Hull and East Yorkshire
Traffic and travel: Overhead line damage at Retford
Kimberley Metcalfe
BBC Local Live, Hull and East Yorkshire
Overhead wire problems between Redford and Doncaster are causing delays on the route to Hull.
You can find all the latest information here.
East Yorkshire paralympians settle into Rio
Kimberley Metcalfe
BBC Local Live, Hull and East Yorkshire
It all kicks off in Rio tomorrow for the Paralympics.
Grimsby javelin thrower Hollie Arnold shared this tweet last night... I hope she was heading to bed. She's got a very busy couple of weeks ahead.
Football: Phelan to be made permanent?
BBC Sport
Some news for Hull City fans as the Hull Daily Mail are reporting that Mike Phelan is close to becoming their permanent manager.
Two wins out of their first three Premier League games, which includes beating champions Leicester City, would not have done his chances any harm.
Investigations continue after bodies found at house
Phillip Norton
BBC News
I'm outside the house on Bude Close, New Waltham where the bodies of a man aged 55 and a woman aged 46 have been found.
Humberside Police say they are continuing investigations but are not looking for anyone else.
Your headlines this afternoon
Gill Sennett
BBC Local Live, East Yorkshire and Humber
Here are the latest headlines for East Yorkshire & Humber:
Strange clouds: Keeley explains it all...
Kimberley Metcalfe
BBC Local Live, Hull and East Yorkshire
Earlier I showed you some photos of some unusual cloud formations that have been appearing across East Yorkshire.
Here to explain more is Keeley Donovan.
Man and woman found dead at house
The bodies of two people are found at a house in a village in North East Lincolnshire.
Read more'My family don't quite understand it' - Peacock
BBC Sport
More on the news that former England captain Jamie Peacock is coming out of retirement to play for Hull KR for the rest of the season.
In a statement on the club's website, Peacock says: "Although my family don't quite understand it, this feels like the right decision. The time has come for me to put my boots on again.
"Physically, it may take me some time to get back up to speed, but I've been preparing as best I can and mentally I'm in a good place."
Peacock, a multiple Super League, Challenge Cup and World Club Challenge winner who was crowned Man of Steel in 2003, could make his return against London Broncos on Sunday.
Ex-England captain Peacock out of retirement to play for Hull KR
Former England captain Jamie Peacock is coming out of retirement to play for Hull KR for the rest of the season, he has announced.
Peacock, now 38, hung up his boots after helping Leeds to victory in last October's Grand Final and took up the role of head of rugby with the Robins.
However, the Robins are fighting for their Super League survival and Peacock aims to help them through a late-season injury crisis.
Tennis: Kyle Edmund names in Davis Cup team
Matt Dean
BBC Radio Humberside
Kyle Edmund has been named in the Davis Cup team to face Argentina in the semi final later this month.
Andy Murray, Dan Evans, Jamie Murray and Dom Inglot have also been selected, with Evans chosen ahead of James Ward. Liam Broady will also be travelling as part of the team.
Weather: A dry and warm afternoon
Keeley Donovan
BBC Look North
Staying dry and feeling muggy this afternoon.
Some low cloud, mist and fog developing with a minimum temperature of 17C (63F).
Your headlines this lunchtime
Gill Sennett
BBC Local Live, East Yorkshire and Humber
Here are the latest headlines for East Yorkshire & Humber:
BreakingTwo bodies found in New Waltham
BBC Look North
East Yorkshire and Lincolnshire
A man and woman have been found dead at a house in New Waltham near Grimsby.
A 55-year-old man and a 46-year-old woman were found in the house on Bude Close in the early hours of this morning.
Police have launched an investigation but say they are not looking for anyone else in connenction with the the deaths