Celtic boss Neil Lennon has described his side's Champions League trip to Ajax as "pivotal" as they attempt to reach the last 16 of the tournament.
The Scottish champions face their Dutch counterparts on Wednesday knowing that a win will keep alive their hopes of progressing from Group H.
Celtic earned a 2-1 victory over Ajax when the two teams met at Parkhead two weeks ago.
"The game in Amsterdam is pivotal," BBC Sport quotes Lennon as saying.
"It's a huge game and we started working on it - the team selection and the way we'll play - as soon as Saturday's game [against Dundee United] finished."
Lennon's side made it through to the last 16 of last season's competition before they were beaten by Juventus.
