By London correspondent Tony Hughes

West Ham are faced with some key decisions this week amid growing interest in their fringe players from rival clubs.

The Sun reported on Tuesday night that Manchester United have have submitted a bid worth up to £15million for 17-year-old defender Reece Oxford.

Now the Daily Mail has claimed that Sunderland are preparing a £10million offer for striker Diafro Sakho.

Oxford has reportedly been attracting the attentions of United for quite some time, but the Manchester club were believed to be stalling on making their move as they waited to switch managers.

Jose Mourinho was announced as the new United boss at the end of last week and his first major transfer move seems to have been to sanction the push for Oxford.

It is reported that the promising defender has already rejected a new bumper deal from the Hammers worth £12,000-a-week in wages.

Meanwhile, the Mail claim West Ham are ready to give permission to Sunderland to hold talks with Senegal international Sakho over a summer transfer.

The 26-year-old has had a frustrating season at Upton Park, scoring seven goals in 24 appearances and struggling to cement a regular starting position following the return to fitness of Andy Carroll in the second half of the campaign.

Oxford captained West Ham’s Under-21s side to Premier League Cup glory this campaign and was the star of the show when the Hammers beat Arsenal on the opening day of the season, but has struggled to hold down a regular spot in the first team since then.

The 17-year-old still has two more years to run on his current contract at West Ham and United’s initial offer is £10million rising to a potential £15million if the defender meets certain performance related expectations at Old Trafford.

The centre-back is reportedly unhappy with the amount of playing time he received from the Hammers and his agent Aidy Ward, the same man who handles Raheem Sterling’s affairs, has been pushing for a better deal.

Oxford would also receive a substantial rise in wages if he opted for United and made just two more starts in the league after he burst onto the scene in August.

In other West Ham news, the Hammers have made a £11.4million offer for an Argentine playmaker who could rival Dimitri Payet for a starting place.