Sunderland appear to be keen to strengthen their defensive options.
The Austrian defender is said to be interesting a quartet of Premier League clubs, with the Hornets looking to beat their rivals to the 23-year-old.
A Mackems scout was spotted at Austria's friendly defeat to the Netherlands.
Austria duo Aleksandar Dragovic and Martin Hinteregger could be targets.
Claudio Ranieri is hoping to strengthen the Foxes' options heading into the second half of the season.
Celtic take on Red Bull Salzburg on Thursday - and two Premier League clubs will be watching with intent.
West Ham have reportedly scouted Austrian duo Aleksandar Dragovic and Martin Hinteregger.
Arsenal, Liverpool and Manchester United have recently been linked with swoops for Red Bull Salzburg defender Martin Hinteregger – who is he?
The agent of Manchester United admired Martin Hinteregger has stated that the centre-half proposed transfer fee has will more than €10 million.
It is reported in Portugal that Manchester United had scouts in Amsterdam to watch Martin Hinteregger in action.