Ajax's record signing Sebastien Haller was mistakenly left off their Europa League list, the club have confirmed.
Clubs competing in the Europa League round of 32 submitted their final squads, which consists of up to 25 players, on Wednesday, but Haller was not included in Ajax's list.
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"It is indeed true that Haller is not on our Europa League list of players," an Ajax spokesperson told ESPN NL. "We are working with the KNVB and UEFA to find out where things went wrong.