However, Riga is confident he can be a success for Wanderers.
"I've fully recovered from injury but I haven't been on the pitch much and it's been tough for me," he told the Bolton News. "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. 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. I'm trying to stay cool and not lose my head. I just want to finish the season and see what happens."