Manchester United manager, Ole Gunnar Solskjaer, could be without up to 11 players for their Premier League opener against Crystal Palace this weekend.
United were given an extra week to prepare for the 2020/2021 season, after their Europa League campaign run into August.
The Manchester Evening News reports that Paul Pogba, Juan Mata, Fred, Aaron Wan-Bissaka and Eric Bailly only returned to full training on Monday, while Bruno Fernandes started only days before.
Phil Jones is fit, but is unlikely to be selected, as he could leave Old Trafford in the coming days. Sergio Romero is in the same situation, but is yet to return to training as he seeks a move away.
Mason Greenwood is still training in isolation after returning to Carrington last week. The young striker was sent home from England camp after breaching COVID-19 guidelines in Iceland last week.
Axel Tuanzebe is definitely out for the visit of Palace, as he continues his recovery from a long-term injury.
Victor Lindelof and Anthony Martial are set to be assessed by United medical staff, after they went on international duty for Sweden and France respectively.