Manchester United boss Ole Gunnar Solskjaer insists Cristiano Ronaldo is a superior striker to Liverpool's Mohamed Salah.
The pair will face-off on Sunday at Old Trafford.
Solskjaer offered his thoughts on the Salah-Ronaldo comparisons.
"I will always back Cristiano Ronaldo in any competition," he said. "His goal-scoring record is fantastic. That said, Mohamed Salah is on fire.
"We have to be at our best to defend against him. We have to do a good job, not just against him.
"I am a big admirer of their frontline. They're players you have to be nailed on for 95 minutes against to keep a clean sheet.
"Liverpool are one of the teams we've been trying to catch over the last four years. We have to improve to get up to their level of the last four years."
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