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.
The Latics will reportedly move for Villa's Alan Hutton if they fail to secure Hearts' Callum Paterson.
Newcastle United are reportedly looking to sign Hearts star Callum Paterson.
A select round-up of the latest news involving Mark Warburton's Glasgow Rangers and Brendan Rodgers' Hoops.
Celtic are reportedly interested in signing Hearts defender Callum Paterson.