Paul Ince has named the player Manchester United boss would seriously regret to have let go, following Marcus Rashford's long-term injury.
Rashford is likely to miss United games for six weeks, suffering a double back fracture as well as a piece of floating bone in his foot.
The Red Devils will have to rely on their players, including Anthony Martial and Mason Greenwood. The club is possible to sign a striker with a five-month loan as well.
However, Ince thinks the case wouldn't give much trouble if Solskjaer didn't sell Romelu Lukaku to Inter Milan during the summer transfer window.
He said: "If Ole wasn’t already regretting letting Romelu Lukaku go, he seriously will be now. I’ll be the first to admit that I had a go at him at times, and he can’t retain the ball, but you do get 20-25 goals a season from him. United let him go without replacing him, and now they’re paying the price. Hindsight is a wonderful thing but really, Ole should’ve never let him go."