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Swansea City boss Francesco Guidolin says he is uncertain about captain Ashley Williams' future at the club.

The 31-year-old defender, who has made over 300 appearances since joining the Swans from Stockport County in 2008, has been linked with a move

"For me the transfer market is too long," Guidolin said after his side's 4-0 pre-season friendly win over Wolves at Molineux.

"Ashley is very important to us and I don't know what the situation is."

Williams has been on holiday since leading Wales to the semi-final of Euro 2016 and returns to training on Wednesday, 3 August.

He has two years left on his Swansea contract.

Neil Taylor, Gylfi Sigurdsson and Lukasz Fabianski have also had extended breaks after playing in the European Championship finals.

"It's important for us, for our international players to have a long period of holiday. Three weeks is not very long but I will be happy to see them on Wednesday," said Guidolin.

The club have been linked with moves for Leicester City striker Leonardo Ulloa as well as Sevilla's Fernando Llorente.

Portuguese striker Eder has moved to Lille, Italian Alberto Paloschi has joined Atalanta and Frenchman Bafetimbi Gomis has signed for Marseille on loan.

The Swans begin their top-flight campaign against Burnley at Turf Moor on Saturday, 13 August.

"I can say we are almost ready for the beginning of the season. I feel good, I feel optimistic I am ready to begin," Guidolin added.

Swansea beat Wolves in their third game in a week, having claimed victory against Bristol Rovers 5-1 and Swindon Town 3-0,

"[Beating Wolves] was a different game, a different attitude on the pitch for my players. This week was not easy for us, there were many travels, many kilometres in the coach."