Brendan Rodgers' team qualified from their group as runners-up to Salzburg and now face Marcelino's men, who trained at Celtic Park on Wednesday.
Valencia dropped into the Europa League knock-out stage after finishing third in their Champions League section behind Juventus and Manchester United.
Celtic have been in excellent form since returning from the winter break, winning seven games in a row without conceding a goal, while Valencia have lost just one of their last nine matches.
The second leg takes place in Spain on Thursday February 21.
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