The 17-year-old rose to acclaim at the start of last season with a Man of the Match performance in a 2-0 win against Arsenal on his full Premier League debut.
He went on to register just two more top flight starts for the Hammers but remains highly-rated as one of English football’s most exciting youngsters with 22 caps for the Junior Lions.
Manchester United have been strongly linked with the teenager this month, amid reports claiming Jose Mourinho sent scouts to watch his progress at the U19 European Championship.
But it appears any formal transfer approach for Oxford, who can operate as a centre-back or a defensive midfielder, will be rivalled by United’s local neighbours Manchester City.
Indeed, The Sun claim the Citizens are also targeting the £15million-rated starlet, having also sent scouts to run the rule over him in a 2-1 win over the Netherlands U19s on Friday.
West Ham, meanwhile, are working to tie Oxford down to an improved contract – with his current terms due to expire in summer 2018.