Axel Tuanzebe is undergoing a personal training programme back at Carrington as he continues his recovery from a long-term injury while Erik ten Hag hosts a training camp in Spain this week.
The defender was not named in the squad that has travelled for the warm-weather getaway, which has been organised to top up the fitness of the remaining Manchester United players who have not travelled to the World Cup.
United will play two friendlies during the trip; against La Liga strugglers Cadiz on Wednesday and versus Real Betis on Saturday. Among those to fly to Spain is Brandon Williams, who has just returned from a lengthy spell on the sidelines, and outcast Aaron Wan-Bissaka.