Arsenal title winner Paul Merson has questioned Manchester United's deal for Cristiano Ronaldo.
The Juventus striker is in the process of returning to United this weekend.
But Merson said on Sky Sports: "I don't think he will be nowhere near as good [as last time in the Premier League]. 50 per cent [as good]?
"His numbers are still phenomenal, don't get me wrong, but if he does it at 36 in the Premier League, you'd have to think he is not human!
"Does it knock Greenwood and Sancho back? They will certainly be able to watch him and think, 'This is how I've got to live my life for the next 10 years because it's a short career. He will set an example but will he win the league for Man Utd? I'm going to say no.
"I still sit here now and think, why didn't they sign Harry Kane to give you a three-, four-year option? This is a big deal for - in my opinion - one season only. He was unplayable last time but I just don't see that in the Premier League now."
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