Manchester United boss Ole Gunnar Solskjaer knows Cristiano Ronaldo has an excellent record against Champions League opponents Villarreal.
Ronaldo has a record of 13 goals against Villarreal.
Solskjaer said: "You can almost say he's worth one guaranteed goal.
"He enjoys playing against Villarreal and knows they have top defenders. It is not going to be easy but it is not easy playing against Cristiano.
"The more he understands the way we play, the better he'll become."
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