Ipswich Town's 31-year-old could be available on the cheap in January.
West Ham United were reportedly readying an offer for the Heart of the Midlothian right-back.
Steve McClaren has questions to answer going into the January transfer window.
Birmingham City and Derby County have been heavily linked with moves for the Hearts right-back.
Derby County boss Steve McClaren has personally watched Hearts' Callum Paterson, who is also in Watford's sights.
Souttar has been linked with a move to Aston Villa in January.
Derby County are taking a look at four Heart of Midlothian players, according to manager Steve McClaren.
After the Derby County boss was spotted at Hearts' game against Glasgow Rangers on Wednesday, could the following Tynecastle and Ibrox stars feature on his shortlist?
Could Championship rivals Derby County and Sheffield Wednesday do battle for the second January running?
Celtic have snapped up Cristian Gamboa, but Jozo Simunovic looks to be leaving the club.