How he passed the medical to move to Upton Park was a big surprise to many, and Dyer has only started four matches for the Hammers since joining them in August 2007.
West Ham manager Gianfranco Zola insists the former England international will not be rushed back into the first team despite the club's perilous position near the foot of the Barclays Premier League.
Dyer, 30, is available again after recovering from a hamstring injury which has sidelined him since the end of September.
It is the latest attempt by the former England midfielder to revive a career that many believe is grinding to a halt owing to the sheer number of injuries he has suffered in recent years.
Zola: "He's an important player and he's a quality player. It's good to have him back available.
"When Kieron Dyer is fit he can bring something different but what we don't want right now is more setbacks.
"I don't want to put pressure on him. He's been out for a long time. I'm seeing him very positive, he's bright and he just needs to train a lot and be able to play to his standard for a long period.
"I don't think he will start but I have yet to make a decision."