Ajax have confirmed that they have accidentally left club-record signing Sebastian Haller out of their Europa League squad.
Haller was brought in from West Ham last month, with the striker joining the Eredivisie giants in a €22.5 million (£20m/$28m) transfer from the Premier League outfit.
The Ivory Coast international has started well for Ajax, scoring two goals and adding four assists in six league appearances thus far.
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But it appears that the 26-year-old is in danger of being unable to represent his new side in European competition this season, with the club confirming the mistake in a statement to AD.