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Roy Keane admits Cristiano Ronaldo's time at Manchester United could get "ugly" if they hold onto the striker and struggle early on in the season.

The forward has made it clear he wants to quit Old Trafford, despite spending less than 12 months back at the club, who have made it clear they expect him to see out the remaining year of his deal. Despite showdown talks, Ronaldo remains a United player.

The Portuguese superstar has previously looked to quit the Manchester outfit to pursue other ambitions. That was back in 2008 when Real Madrid came knocking - but Sir Alex Ferguson told him to ride it out for 12 months. Not only were United winning silverware, but Ronaldo had time on his side, being in his mid-20s.

Now, at 37, Ronaldo wants to win and has little time for a transitional phase, which United are in. Keane, who saw a host of players come and go during his time at the club, concedes though that a slow start to the year could see the situation at Old Trafford go south.

The Irishman said on Sky Sports: "He wanted to leave Man United many years ago and Ferguson said 'Stay another year' and he got his head down - he was a bit younger. My worry is if they say 'Your'e definitely staying' and they start the season not great, he's resentful towards the manager and then it could get ugly."

Ronaldo scored over 20 times for United last term, but his goals could not guide them into the Champions League. Not playing in that