After recovering from shoulder surgery, Rashford made his first appearance of the season against Leicester City on Saturday, scoring in the 4-2 defeat.
The England forward scored again for United in the 3-2 win over Atalanta on Wednesday.
And Solskajer is excited about his impact on the team.
Speaking after the Atalanta game, Solskjaer said: "We had chances in the first half, from Marcus's runs, and he kept on going and, in the end, he got a knock.
"But he's going to be very, very important for us."
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