Inter Milan are close to signing Manchester United striker Romelu Lukaku after submitting an improved bid.In July, United rejected Inter's £54m bid for Lukaku, who has been fined by the club after missing training without permission on Tuesday.Belgium international Lukaku, 26, has trained at his former team Anderlecht for the past two days.Lukaku's agent, Federico Pastorello, flew to London on Wednesday in an attempt to resolve his future.The clubs had been some way apart in their valuation of the striker, with United wanting to recoup at least the £75m they paid Everton two years ago.Inter and fellow Serie A side Juventus have been competing to sign the forward, who did not play in the Premier League club's pre-season matches because of injury.Inter manager Antonio Conte has previously confirmed the striker remains his number one target, saying: "I consider him a player who could improve our team."