Juventus striker Nicklas Bendtner has undergone successful surgery on a thigh injury, the Serie A club have confirmed.
The on-loan Arsenal forward was treated in London by Arsenal consultant Ernest Schilders after suffering the injury in last week's Coppa Italia meeting with Cagliari.
A statement on Juve's official website confirmed that the 24-year-old has had the adductor longus tendon in his left thigh reinserted, with his prognosis and rehabilitation schedule to be verified with English doctors over the next few days.
Bendtner, who is likely to miss at least two months, has been a peripheral figure since joining the Italian champions on a season-long loan this summer.
Williams is aware of the threat posed by Van Persie, but he believes Swansea have a plan to keep the Dutchman quiet on Sunday.
Wales captain Williams, who was named man of the match in last Sunday's defeat against Tottenham, is relishing the challenge of pitting his wits against Van Persie and feels the key to stopping him is to cut off his supply line.
"Van Persie's on fire at the minute and playing with a lot of confidence so we just have to work to stop him and stop the service into him," Williams told the Daily Express.
"There's no doubt he's going to get a couple of chances, that's just the way it goes against a quality team, but we have to dominate possession and starve them.
"He's one of the best strikers in the Premier League if not the best. Technically he's very good and you can all see his goalscoring abilities.
"He's a complete player and was one of the best I played against last season. You watch Manchester United so many times so you know what they're all about. But trying to stop them is a different thing altogether."
United did the double over Swansea last season and Williams feels they showed too much respect to Sir Alex Ferguson's side last term at the Liberty Stadium when they lost 1-0.
However, Williams has promised things will be different this time and that Swansea will show no fear against the current Premier League leaders.
"It is true that we showed United too much respect last season. We sat back too much in that first half and then got at them," added Williams.
"We deserved a draw at least. Scott Sinclair missed a chance, an open goal, and they had one chance.
"But this season we've got a lot more belief. We don't fear anyone. We're at home and we've lost two on the bounce so it would be great going into Christmas to get a positive result."
Messi's current deal runs until June 2016 and the new agreement will keep him at the Nou Camp beyond his 31st birthday.
The forward has enjoyed an extraordinary year, even by his own remarkable standards, netting his 89th and 90th goals of 2012 at the weekend.
The 25-year-old had already surpassed Gerd Muller's 40-year-old record of 85 goals in a calendar year.
He is also in contention to claim a fourth successive FIFA Ballon d'Or crown, being named on a three-man shortlist alongside Cristiano Ronaldo and team-mate Andres Iniesta.
The Football Supporters' Federation (FSF) has become increasingly vocal in wanting to bring back elements of terracing with the Premier League champions, West Ham and Aston Villa all behind the move.
A club spokesman said: "Manchester City Football Club is supportive of initiatives to enhance - safely - our fans' match-day experience, if supported by the appropriate football authorities."
The FSF's Safe Standing Campaign is supported by clubs of all divisions including Brentford, Bristol City, Burnley, Cardiff City, Crystal Palace, Derby County, Doncaster Rovers, Hull City, Peterborough United, Watford, AFC Wimbledon, the Scottish Premier League, the Safe Standing Roadshow and Stand Up Sit Down.
They are calling for the introduction of a pilot of 'railed seats' - new standing technology which are used in Germany. They are metal seats that can be folded up to create wider clearways.
Aston Villa and Peterborough United have already given the nod to a small scale trial of the technology.
However, the call for terracing was recently lambasted by the Hillsborough Family Support Group set up after the death of 96 people at Sheffield Wednesday's Hillsborough Stadium in April 1989.
Chairwoman Margaret Aspinall said: "There are 96 reasons why it should not be allowed. Standing should never, ever come back. I do not think there is anything safe about standing.
"I feel insulted that while people are trying to fight for justice for Hillsborough, that this campaign is growing now."
