Manchester United icon Roy Keane has admitted he's "sick" of praising Cristiano Ronaldo, calling the new signing a "genius".Ronaldo has returned to Old Trafford, signing a two-year deal with the option to extend for a further year.Ronaldo previously shone at United before leaving for Real Madrid in 2009, though the five-time Ballon d'Or winner is back with the Red Devils again.He was team-mates with Keane during his first spell and left a lasting impression on the outspoken Irishman.And Keane praised Ronaldo again after the Portugal star bagged a late double in the come-from-behind win over Republic of Ireland earlier this week.Speaking on ITV on Thursday night, Keane said: "Brilliant, it is amazing.
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