Sunderland have completed the signing of Celtic right-back Adam Matthews for a fee of £2million.
Diego Poyet is determined to establish himself in Slaven Bilic's West Ham side this season and avoid another loan spell.
Sky Bet have cut Swansea from 40/1 to even-money to make a shock swoop for Barcelona forward David Villa after seeing a string of significant bets.
The online betting firm added the Swans to their 'Transfer Specials' market by request on Wednesday afternoon and immediately saw a flurry of bets, with reports suggesting a three-month loan deal was on the cards.
Sky Bet's Chris Spicer said: "It is certainly a surprising development but, judging from the size of the stakes, it appears somebody knows something we don't.
"The suggestion is that Barcelona could allow the Spain striker to leave on a loan deal in the intention that he can regain form following the leg break, having looked some way off his best since returning at the start of the season.
"The Swans appear good suitors given their current Spanish contingent and preference to playing attractive football."