Besiktas sporting director Ceyhun Kazanci has joined club officials in attacking Dele Alli.
The Everton midfielder spent last season on-loan in Turkey, where he struggled to make an impact.
Several Besiktas officials have publicly criticised Alli in the past week and now Kazanci has had his say.
He snapped: "The fans had high expectations. Knowing that Dele Alli was once valued at 100 million euros, fans expect a lot of goals and assists, which is not easy in the Turkish league.
"We thought he would be more proactive, work harder and fight for the team, but that was not the case. Eventually the coach started using other players and then Alli stopped struggling. He can't handle adversity."