straight to your inbox every day for freeOle Gunnar Solskjaer said he did not want to alter the shape of Manchester United's formation when he introduced Edinson Cavani at half-time against Southampton.Cavani replaced Mason Greenwood with United 2-0 down at the interval despite creating clear-cut chances for Greenwood at 0-0 and Bruno Fernandes with Southampton 1-0 up.Greenwood, 19, was making his first start in four weeks but his inexperience was replaced with the expertise of the 33-year-old