Leeds United and Brighton and Hove Albion have been linked with Harry Cochrane of Heart of Midlothian in the summer transfer window.
Former Rangers star Steven Naismith joined Heart of Midlothian on loan in January.
Championship club Derby County were keen to lure John Souttar to Pride Park in January from Scottish Premiership side Hearts.
Scottish Premiership champions Celtic have raided Premier League giants for loan signings over the years but not Manchester United's Demetri Mitchell.
The former Scotland manager and Celtic captain have been embroiled in a war of words since Celtic's dominant win over Hearts last month.
The Hearts manager was quick to criticise Brown following the Celtic player's challenge on Harry Cochrane which left the 16-year-old injured.
Craig Levein has criticised Celtic's Scott Brown following Hearts' 3-1 defeat at Parkhead.
Newcastle United have been heavily linked with a move for a striker but they have failed to deliver on that front in the January window.
The Edinburgh club confirmed they are in search of a new midfielder and striker before the transfer window closes.
Sunderland have been linked with Kyle Lafferty of Heart of Midlothian in the January transfer window.
Former Southampton, Liverpool, Blackburn Rovers, Rangers, Celtic, Stoke City, Watford, Coventry City, Middlesbrough and Tottenham Hotspur employees are all potential candidates ... but who do you want to see at the helm?