Saracens have confirmed they are investigating reports that Billy Vunipola was arrested following an alleged violent incident at a pub in Majorca.
It is claimed that the 31-year-old was tasered twice by police in the early hours of Sunday morning.
Local reports claim police rushed to a bar called Epic in the island's capital Palma at 4.30am.
It is alleged that the Australian-born star had taken his shirt off and was threatening customers and employees with bottles and chairs.
Vunipola is claimed to have been unaffected by the first taser volt used by police and a second had to be fired.
The number eight, who weighs nearly 20 stone, was then overpowered and handcuffed by the officers.
Vunipola was taken to a local hospital, where reports say he had to be sedated and strapped to his bed.
He was kept under guard before pictures and video showed him arriving at court later on Sunday wearing the same blue T-shirt and beige shorts as the previous night.
He has been released on bail pending investigation. Police are yet to comment on the alleged incident.
But his club have now confirmed they are investigating. A statement from Saracens reads: "Saracens is aware of an incident involving Billy Vunipola in Majorca.
"We will of course deal with this incident internally, and will not make any further comment until then."
Vunipola was born in Sydney to Tongan parents in 1992 before moving to Wales with his family in 1998.
He earned a scholarship to attend Harrow School and joined Wasps in 2011 before moving to Saracens in 2013.
He has won 75 caps for England since making his senior debut in the same year.
Vunipola hasn't played for his country since last year and was not picked for the Six Nations.
He is widely expected to leave Saracens for Montpellier next season which would all but end his hopes of an international recall.
England players who are based abroad are not eligible to play for the national team.
Vunipola had a falling out with England coach Steve Borthwick during the build-up to the 2019 Rugby World Cup.
LATEST SPORTS NEWS:
Borthwick was assistant coach at the time and Vunipola admitted he was 'out of line' with some comments he made.
He told the Telegraph: "I was very, very ahead of myself back then because we had just won the double with Saracens, I had played really well in the semi-final and final and knew I was going to be in the England squad.
"I had a conversation with Steve about rugby after training when we were in Treviso. I said a few things that were out of line, basically.
"I said some things that never should have been said to Steve in that way, but also in front of other people.
"We had already had conversations about my rugby in January (2023) and it is important to say that I don’t believe it had anything to do with me not playing in the Six Nations.
"But I felt it was important for myself to address the issue and actually apologise to Steve, having matured a little bit.
"I just wanted to let him know that I was sorry, because I am sorry, you know. He should never have been in that situation where I’ve made him feel like I was patronising towards him.
"Especially as an elder, not just the coach but someone who is older than me. It was very disrespectful what I did to Steve."
