"I don't know what the problem is but the main thing for young English keepers is they have to play games," he told the Sunday Times.
"If you're very talented, an 18- or 19-year-old goalkeeper, I don't think it's good to go to a big club where all you are going to do is play in the reserves.
"It's much better to go abroad and play somewhere because that's going to give you the experience you need. When I came here I was 22 and had already played 118 league games in Finland. I started when I was 17.
"When you come to England, the standard and speed is totally different, but you still have the pressure, the television cameras, the people expecting you to win and the club paying your wages and depending on you - just like you did before. The main thing for any goalkeeper is first-team football."
Meanwhile, Bolton boss Sam Allardyce is reportedly keeping tabs on Man Utd's Quinton Fortune, Portsmouth's Gary O'Neil and Liverpool legend Robbie Fowler.