The former Tottenham defender joined ASM in the summer after coming off contract at Bayern Munich.
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However, Dier has struggled to make an impact in Ligue 1 and is being offered to Premier League clubs this month.
TalkSPORT says West Ham are keen on the England international, with a return to London likely suiting Dier and his family.
At Monaco this season, Dier has managed just six Ligue 1 appearances. His contract runs to 2028.
