Britain's Menelik Watson has been dealt a cruel blow ahead of the new NFL season after rupturing his achilles tendon in a pre-season game on Sunday.

The Oakland Raiders offensive tackle limped off during their 30-23 loss to the Arizona Cardinals and he confirmed the news on his injury on Twitter.

Watson vowed to return stronger but is likely to be out of action for four to six months.

Menelik Watson leads his team out prior to the Oakland Raiders' clash with the Miami Dolphins at Wembley

Watson (right) poses at Wembley alongside Cameron Wake of the Miami Dolphins in July 2014

He tweeted: 'Ruptured Achilles' tendon... I Will be back stronger than ever that's a promise. Main thing is supporting the team right now. #RaiderNation'

Raiders head coach Jack Del Rio added: 'That's a tough break for us. It's really unfortunate. He was having a great camp for us.'

Oakland Raiders offensive tackle Watson (right) blocks Arizona Cardinals outside linebacker Alex Okafor

Green Bay Packers defensive end Datone Jones (right) rushes against Watson at Lambeau Field

Ruptured Achilles' tendon... I Will be back stronger than ever that's a promise. Main thing is supporting the team right now. #RaiderNation — Menelik Watson (@MenelikWatson) August 31, 2015

Watson was born in Manchester before moving to the United States to pursue a career in American football.

He played his college football for Florida State and was drafted in the second round by the Raiders since 2013.