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Norwich, Sunderland and Aston Villa – relegation rivals of the Swans – have also been on the trail of the Utrecht frontman.

The Canaries looked close to landing Haller, 21, but he rejected the chance to move to Carrow Road.

And Norwich boss Alex Neil instead switched his sights to fellow Scot Steven Naismith, 29, in an £8.5m deal with Everton.

Now Swansea, with new head coach Francesco Guidolin working alongside Alan Curtis, are hoping to lure 6ft 2in Haller, who began his career at Auxerre.