Manchester United legend and Sky Sports pundit Roy Keane has warned Ole Gunnar Solskjaer he "must be careful" with how he uses Cristiano Ronaldo.The 36-year-old returned to Old Trafford on a two-year deal worth €23m including add-ons from Serie A side Juventus, having last played for the club in 2009.The five-time Ballon D’or winner has won over 30 major trophies during his career so far including five Champions League titles, four World Cups and a European Championship for his native Portugal.
The striker has featured in three games so far this season, most recently against West Ham at the London stadium – a game in which he scored in the 35th minute.
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