According to The Sun, Mourinho sent his scouts to watch the Swansea centre-back in last weekend's 1-1 draw against West Brom, with Mawson viewed as a potential starter at Old Trafford next season.

The 24-year-old has also attracted interest from Tottenham, who reportedly balked at the defender's £40 million price tag.

That hefty fee won't deter United, however, as Mourinho scours the market for new arrivals to replace the likes of Chris Smalling, Phil Jones and Victor Lindelof.