Website Football Insider is reporting that Manchester United have already sent representatives to Denmark to hold talks with FC Nordsjaelland chairman Tom Vernon about signing Sulemana.
The same article states that Manchester United sent a delegation on Monday to discuss a potential transfer amid speculation Liverpool FC are also interested.
According to the same story, Manchester United are also facing competition from Eredivisie giants Ajax for the Ghana international ahead of the upcoming transfer window.
Football Insider go on to add that the 20-time English champions are ready to outbid Ajax for Sulemana.