straight to your inboxOle Gunnar Solskjaer believes Mason Greenwood will develop into a centre forward for Manchester United but joked the teenager needs to work on his heading.Greenwood, 18, scored his 18th goal for United in the 3-0 Carabao Cup win at Luton Town after coming on in the 78th minute and is in line to start at Brighton in the Premier League on Saturday.Solskjaer settled on an attacking trident of Greenwood, Anthony Martial and Marcus Rashford after the Premier League's restart in