Ten Hag told BBC Sport: "It was a throw-in [for Fulham] in the corner, we had them under pressure and we have one player in the wrong position. As a team we should manage that and make sure everyone is in the right position. We let them escape and it is avoidable. The team showed big character to fight back, we deserved the equaliser and went for the win - we showed big personality and character. It was that mistake. Before that we went for the win and we should have taken our opportunities."
He added: "With the squad we had today we should have won this game. Both halves were slow starts and we should be ready from the first whistle. That's a point of criticism but the team showed big character in both halves."