Williams team principal Sir Frank William🅘s is undergoing tre🦋atment on a pressure sore on his back.

Williams - who is 72 - has been tetraplegic since a road accident in 1986, is currently at Stoke Mandeville Hospital in England, with the team saying he is responding well after routine treatment. A team spokeswoman told Reuters Williams "is likely to be there for at least a coupleඣ of 🅺weeks".

Deputy team principal Claire Williams - Sir Frank's daughter - is missing this weekend's United States Grand Prix in Austin to be with her father, but is due to return i𓆉n time for the Brazilian Grand Prix.

"She wan🎶ted to stay there to make sure he's responding well, which h꧅e is," the Williams spokeswoman added.

Williams currently s🌊its third in the constructors' championship ahead of Ferrari with three races remaining in the 2014 season.