Carlton Cole faces a few weeks out after spraining his ankle in last weekend's FA Cup draw with Middlesbrough, while long-term casualty Dean Ashton has been ruled out for the rest of the season
Tristan has struggled to make an impact at Upton Park since his arrival on a free transfer in October.
The Spaniard could get a chance to stake his claim for a regular run in the side against Bolton in the absence of Cole and Tristan is determined to grab his opportunity.
"I have not played much up to this moment, but I hope that now I can play - I'm totally convinced of my abilities," Tristan told the East London Advertiser.
"I have always played [in my career] and it's not something you forget. I'm getting used to being a part of the team and to English football, which is very quick and played at tremendous speed.
"It is difficult for technical players because the referees never blow the whistle. But I hope I can show my abilities."