The 36-year-old scored two equalisers for United in their 2-2 draw with Atalanta on Tuesday, including a stoppage-time volley.
Speaking to reporters, Solskjaer said: "It is a tight game, flowed both ways, their two goals were very tight and we thought the first was offside, I thought he interfered with David de Gea's view but Cristiano (Ronaldo) is just incredible if there is anyone you want a chance to fall to and a difficult chance, it is just incredible…
"That is football, no one can question the character of these players, because they don't ever give up and give in, they just keep going. We had to make changes and they worked.
"The goal was a proper team goal, great quality on the passing, four or five or six passes before that little exchange as well.
"You don't plan to concede a goal, I thought it was offside, usually he would save that one. The atmosphere was electric, very physical and hard to play against."
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