Ruben Amorim has promised Manchester United fans that his team will improve this season, but warned that he's not been able to make all the changes he wants in one summer.

United kick off their campaign with Arsenal 's visit to Old Trafford on Sunday.

Amorim said the team is already better than the one which finished 15th last season, but the Portuguese coach has also tried to temper expectations by insisting United remain a work in progress.

"We cannot change everything in four weeks but we are better," Amorim said at a news conference on Friday.

"I know we are training harder, so we are better able to cope with the demands of the game. I am really more confident, that is clear. Step by step we are going to be a better team."

One of the reasons for optimism is a new forward line

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