At this stage it remains uncertain when that window will open, given that all major leagues currently remain suspended, but the majority of teams are continuing to identify their top targets.
And the latest reports suggest that the Red Devils are back in for a player who they have been chasing for more than two years, in Juve ace Rabiot.
According to Tuttomercatoweb, United scouted Rabiot earlier this season, and have made plans to swoop for him when the football world gets back to normality.
The 25-year-old could have moved to Old Trafford on a free transfer last summer but opted to head to reigning Serie A champions Juve instead.
The France international has gone on to establish himself in Maurizio Sarri's first XI but despite that, the Turin outfit are still said to be ready to listen to offers for Rabiot.