Graham Potter was surprised Mason Mount was included in Gareth Southate's latest England squad.
Midielder Mount was selected on Thursday only for Potter to confirm 24 hours later that he would not be fit for England's first two and upcoming Euro 2024 qualifiers against Italy and Ukraine.
Mount has missed Chelsea's last three games due to a pubic bone injury and remains out for today's visit of Everton.
Raheem Sterling is also absent due to a hamstring problem though he was omitted by Southgate.
Potter said: 'I'm not aware [of any setback for Mount].