Manchester United legend Lee Sharpe believes Marcus Rashford 'needs to show his heart is in it' after the forward was left out of England's squad for Euro 2024.
Rashford enjoyed the best form of his career last term, plundering 30 goals across all competitions as the club finished third in the Premier League table.
His exploits also helped United win the Carabao Cup, their first trophy in four years.
But the 26-year-old's form has nosedived this season, with the forward netting just eight times.
Marcus Rashford has been told he needs to 'show his heart is in it' after the Man Utd star failed to make the England squad for Euro 2024
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With Rashford struggling, Gareth Southgate has left the forward out of his squad for the upcoming European Championships.
And Sharpe, speaking exclusively to GB News via William Hill, says Rashford needs to knuckle down and show he cares in order to return to form.
"I'm in two minds," he said when asked whether Rashford should stay at United or seek a new challenge elsewhere.
"I don't know where his head is at.
"He has had injuries, form has been all over the place, but he has quality and if he wants to put in a shift, then he should stay and show what he can do because he has shown in the past he has top quality.
"He needs to show his heart is in the club.
"If his head has been turned, then fine, he should go elsewhere to play his football."
United finished eighth in the table, making it their worst-ever Premier League season.
They could yet win a trophy if they're able to beat Manchester City in the FA Cup final this weekend, however.
And Sharpe believes United must start the rebuild right now, rather than waiting any longer.
"It has to start from now," he continued. "You have to start again.
"Some players will leave, some new younger and hungrier players will join.
"The cup Final is a free hit, the players can enjoy it and give it their best and hopefully Man City have over celebrated and Man Utd can catch them out.
"But next season you need fresh legs and a squad that is free from injuries to compete again."
United's era of dominance feels like a lifetime ago.
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Marcus Rashford won't be playing for England at Euro 2024 this summer after Gareth Southgate left the forward out of his squad
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They have had to contend with City conquering football, with Pep Guardiola's side recently winning a fourth league title in a row.
And Sharpe believes United, as well as Arsenal and Liverpool, must do everything possible to close the gap on the reigning FA Cup holders.
"These eras do change," he continued.
"Manchester United had domination for a while, then Chelsea had success, and now Manchester City are top of the tree and there to be shot it.
"It's up to Manchester United, Arsenal and Liverpool to hunt them down.
Marcus Rashford has scored just eight goals for Man Utd this season ahead of Saturday's FA Cup final
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"For Manchester United, it's up to them to really push forward now and stop Manchester City, otherwise they could still dominate for a few years to come.
"With Man City's quality they are only going to maintain their excellent levels, if not increase them with new signings.
"They are probably the best team in the world, difficult to break down and have so much quality."