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The Real Madrid key man has been heavily linked with a move to Old Trafford in recent months.
The Red Devils and Tottenham have both been tipped to sign the injury prone winger, 28.
Jose Mourinho publicly revealed his admiration for the Wales international last summer, despite calling a deal for Bale ‘mission impossible’.
And the bookies claim United could sign Arsenal star Sanchez this week then move for Bale before the transfer window slams shuts at the end of the month.
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MANCHESTER UNITED FC
“Man Utd could land Gareth Bale after signing Alexis Sanchez”
BetStars spokesman Ian Marmion said: “Speculation has mounted that Real Madrid star Gareth Bale could soon be on his way out of the Spanish capital following reports that the Welshman is eager to force through a return to the Premier League after struggling for game time under Zinedine Zidane in recent months.
“Manchester United have long been linked with the Wales international and the Red Devils are the current frontrunners at 5/2 to finally get their man, who could form a formidable attacking partnership with Manchester-bound Alexis Sanchez at Old Trafford.
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“Meanwhile, Tottenham are priced at 5/1 with BetStars to make a shock move for their former midfield maestro.
“Liverpool and Manchester City are the long-shots at 7/1 and 8/1 respectively to add the Real reject to their attacking line-up.”