Riga has been frustrated by his inactivity but he says he is determined to battle his way back into the manager's plans - and repay the faith Wanderers supporters have shown in him.
"If it wasn't for the fans I would already be dead, but they keep me alive," said the Dutch forward. "I hear the fans shouting my name and it cheers me up.
"I've fully recovered from injury but I haven't been on the pitch much and it's been tough for me. It's very frustrating because I want to play and I want to help the team.
"But I'm not a quitter. I will carry on working hard and, as long as the fans stick by me, I will be trying my best to get into the team."
The former Sparta Prague and Vitesse Arnhem ace is convinced he can make an impact on the pitch.
He also told the Bolton News: "It's more frustrating because I know I can help but I can't show it. The style of the Premier League would suit me. When I came here I thought we were going to play for the top six or seven and that was why I chose Bolton.
"But I haven't had much opportunity to show my qualities here and that's what is so frustrating. I'm trying to stay cool and not lose my head. I just want to finish the season and see what happens."