Kevin Nolan is back training with West Ham less than 15 months after being released by the club.
The former Hammers captain has not played since being sacked by Leyton Orient in April following a four-month stint as their player-manager.
Slaven Bilic has given Nolan permission to use the club's facilities at their Rush Green training ground, but Sky sources understand West Ham are not planning to offer the 34-year-old a contract.
Six months half price
Upgrade to Sky Sports now to watch Man Utd v Arsenal and get the first six months half price!
West Ham have won just three of their opening 11 Premier League matches and sit in 17th place, just a point clear of the relegation zone.
Nolan joined West Ham from Newcastle for £4m in June 2011 and played a leading role in their promotion to the Premier League via the Sky Bet Championship play-offs the following May.
The former Bolton midfielder scored 31 times in 157 appearances during his four years at the Boleyn Ground but was allowed to leave by mutual consent in August 2015.
Meanwhile, Carlton Cole is continuing to train with West Ham following his release from American third-tier side Sacramento Republic.