And Scholes thinks Solskjaer should've stopped Lukaku joining Inter Milan if he didn't have a replacement lined-up.
He told talkSPORT: "That's the one thing that disappoints me.
"He (Solskjaer) obviously knew they were going to sell Lukaku at some point, but not to have a centre-forward lined up seems like a mistake to me.
"Whether they did, whether it dragged on too long from the club's point of view, I don't know.
"They're going into a season without a centre-forward when it's a club that is known for its attacking style and had probably four centre-forwards in its heyday.
"So to go in there with Rashford and Martial, who you're not quite sure if they're left-wingers or centre-forwards, we don't know. But I'm sure it'll get sorted."