"It is a small injury, two or three weeks. It is a risk in high-intensity training," Ten Hag explained at a press conference, following on the club's earlier statement.
He added: "First of all, striker options are most difficult to fill this in, especially on our level. Last season, Martial did great things for us. We played our best football last year with Anthony Martial as a striker. He is also on high payment in this club, so when you bring another one in, you strike him out."
Ten Hag called it "naive" to suggest United simply should have planned better last summer, continuing: "Strikers are not cheap. We thought, we had options. When [Martial's injury] develops, I wanted to bring in a striker in the winter, but it was not possible. And, similar, was the problems we already had with FFP in the summer.There was real shortage on good options. That is why we were very happy to sign Rasmus Hojlund, who is a player at the level of Manchester United."