Ajax will try everything possible to have record signing Sebastien Haller available for the Europa League knockout rounds after failing to register the Ivory Coast international, coach Erik ten Hag said on Thursday.
But he conceded an administrative error will likely cost the club a vital player in their bid to win the trophy, blaming a computer glitch for leaving the 26-year-old French-born striker off the additions to the squad for the rest of the competition.
"It is of course incredibly annoying. Firstly for the player, but also for us. Of course we didn't sign him for nothing," Ten Hag told a news conference.
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“Haller was indeed on the list, but it is an administrative error. Something went wrong with the computers, just a check mark on and off.
“In the first instance, (technical director) Marc Overmars and I are responsible. Of course, people makes mistakes, but this is a top sports organisation. This mistake should never have happened.
“Haller is of course also very disappointed. Although he also understands that this was not done on purpose,” said Ten Hag, who added there was little chance of leniency from UEFA.
“But we will keep trying as long as there is hope."
Haller, who signed from West Ham United for €22.5m last month, is currently ineligible for Ajax’s last-32 clash against French frontrunners Lille later this month.

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