The Magpies youngster had been tipped for an England Under-21 call-up following a series of superb performances

Newcastle are to be without midfielder Sean Longstaff for the remainder of the season as the 21-year-old has been ruled out for four months with a knee injury.

Longstaff was left on crutches after a challenge with Robert Snodgrass during Newcastle’s defeat by West Ham last weekend, and he was forced to visit a specialist to find out the extent of the damage.

1 Longstaff has enjoyed a rapid rise to fame

And it was confirmed on Thursday morning that Longstaff will be sidelined until July due to his injury, which means he will miss Newcastle’s final nine matches of the Premier League campaign.

The lengthy lay-off comes at a dreadful time for the youngster, who has recently established himself as a key player for the Magpies.

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He made his first league appearance for Newcastle last December and has since played a further eight times, with his performance in the club’s January defeat of Manchester City widely lauded.

The 21-year-old scored his first goal for the Magpies in February, and he was being tipped for an England Under-21 call-up later this month.

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Aidy Boothroyd’s side have friendlies against Poland and Germany coming up later this month, but Longstaff will have to wait until next season before debuting for the Young Lions.