Manchester United's new manager Erik ten Hag's first look at his squad in a match environment could be hindered by the absence of centre-back duo Raphael Varane and Harry Maguire.
United are in Thailand currently ahead of their first pre-season game against Liverpool on Tuesday.
The Red Devils held two sessions on Monday with the first at the STB Academy before moving on to the Rajamangala Stadium, the venue for the friendly, with Varane missing entirely from the latter one.
The 29-year-old did train with the team on Monday morning but was absent for the open session which was conducted in front of a few thousand fans.