Ibrox side Rangers and Hibernian will face each other in the final of the Scottish Cup on Saturday.
The Hammers defender is seen as an indispensable part of the side by the club, but has been interesting teams including Liverpool.
The Black Cats have been through three more managers ever since O'Neill's departure.
The Werder Bremen defender reportedly wants a Bundesliga stay.
Gary Megson claims the owls were built on free transfers and loans.
The 20-year-old only recently signed with Las Palmas.
The Romanian side believe Celtic are the easiest tie they could get.
Rangers take on Hibernian in the Scottish Cup final this weekend looking to make it a triple success at Ibrox this season.
Celtic have appointed Brendan Rodgers as their new manager.
Arsenal have been linked with a move for Alvaro Morata in the summer transfer window.
Chelsea host Manchester United on Sunday afternoon.
Leeds United are set to take on Norwich City on Tuesday evening. The Canaries currently sit four points behind Newcastle United in the Championship.
The Newcastle United man continues to impress for the Magpies.
Should Leeds United try move for the West Ham United forward?
Aston Villa sold Adama Traore to Middlesbrough during the summer transfer window.
Ibrox side Glasgow Rangers are due to meet Celtic in the Scottish League Cup later today.
The 20-year-old impressed for West Ham United on Saturday.
Tottenham Hotspur could only draw with Bournemouth on Saturday.
Liverpool are the bookies' favourites to sign Steven Gerrard, with Celtic second on the list.
Liverpool beat West Bromwich Albion 2-1 at Anfield.