Viljami Sinisalo insists Celtic have "a lot more to come from the group".
The goalkeeper's statement comes after their commanding 3-0 Champions League play-off lead over LASK. Benjamin Nygren and Camilo Duran, who scored twice, gave Martin O’Neill’s side the advantage at Celtic Park.
Despite the lead, the Austrian champions managed to keep Sinisalo busy throughout the match, having had two efforts ruled out for offside.
The Finnish keeper made eight saves and admitted that Celtic were not at their best. Sinisalo said: "I think we can be better, as weird as it may sound. The big moments went for us, and there’s a lot that we can do better.
"Ultimately we’ve come away with a 3-0 win so we’ve got to be happy, but I think there’s a lot more to come from the group."
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The 24-year-old suggested that the need for so many saves indicated room for improvement. He said: "But if there’s a game where I need to make that many saves, I think something else could have been better.
"We understand that as a group and ideally I want to be a Celtic goalie that doesn’t need to make that many saves."
Sinisalo has only played once previously in Europe, in Celtic’s 1-0 win in Stuttgart as they exited the Europa League last season, but he is determined to make more Champions League memories.
He said: "It’s a funny one because not many Finnish players play in the Champions League or get that opportunity. It’s something you dream about. But anything you dream about, once you get that taste of it, you just want more and I’m no different in that way.
"You hear that, it brings a smile to your face and shivers and stuff like that, but you just want more and want to belong at that level. It’s like anything in life, if you want something, you get something, you just do it again and again and again.
"It’s no different from winning trophies. Once you win one, you just want to win more."
