Manchester United have told Mason Greenwood to improve his attitude if he wants to be offered a new and improved deal at Old Trafford.United are stalling on talks about a bumper new contract for the troubled teenager.Club chiefs have become increasingly worried about the behaviour of Greenwood as he continues to endure a torrid period in his fledgling career.Greenwood was thrown out of the England squad in September and flown home in shame after being caught smuggling women into the team hotel in Iceland.The striker was forced to make a public apology and was given a dressing down from United boss Ole Gunnar Solskjaer.Since returning to the first team picture, the 19-year-old has been given further warnings about his poor time keeping and.
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