Brendan Rodgers admitted his Celtic side must learn from their 2-0 home defeat to Valencia in the first leg of their Europa League last-32 tie.
The La Liga side took the lead just before half time through Denis Cheryshev and Ruben Sobrino doubled their lead early in the second period.
Los Che held on to their two-goal advantage with few alarms and can be backed at 13/2 to win next Thursday's second leg in Valencia 2-0 and at 16/1 to win the Europa League outright.
Meanwhile, Celtic are available at 9/20 to beat Kilmarnock at Rugby Park when they return to domestic league action on Sunday.
"They were very organised and compact," Rodgers said of Valencia.
"Unfortunately for us, we made too many mistakes, especially in the first half. When you do that against good teams it kills your momentum and puts you on the back foot.
"At this level you really have to concentrate. It ended up being a disappointing night for us.
"We have to try and learn from it. We have it take it on the chin and we go next week to Valencia. It will be a very difficult game for us but if we can get the first goal then it can bring a different possibility for us."
Celtic are 16/1 to qualify for the last 16.