Rodri. Manchester City's star Spanish midfielder, limped out of Sunday's English Premier League clash with Arsenal with of a knee injury, while two other top players, Kevin De Bruyne and Martin Odegaard, have been sidelined in the early weeks of the season.
Rodri's injury, which may rule him out of the rest of the season, came days after he voiced concerns about an increasingly congested schedule and said players were close to taking strike action.
Ten Hag, speaking ahead of United's Europa League match against FC Twente, said too much is being asked of players.
"There are too many games. It's clear. Too many competitions," he said on Tuesday. "For the top players, they are overloaded and this is not good for football. In the end of the day it's maybe good for commercial but there is a limit.
"It's almost unavoidable that players get injured because of the overload from so many games."
City are still to confirm the full extent of Rodri's injury after he was photographed in Spain, where he was reportedly undergoing tests.
British media reported there were fears the Spain international has sustained an ACL injury and is set for a long-term absence.
City manager Pep Guardiola said last week that it was up to players to force a change following the growing dispute over the congested schedule.
The Champions League has been expanded this season, with two more games in the new-look group stage. Next year's expanded Club World Cup will be a 32-team event for the first time, up from seven. It is slated for the off-season for many major leagues in June-July.
The new Club World Cup format has prompted a legal challenge from players' unions.
World players union FIFPRO have raised concerns about the increasing physical and mental demands on players, but the competition has been welcomed by the European Club Association, who represent the continent's top clubs, including United and City.
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