Get the City transfer window latest, team news, match updates and analysis delivered straight to your inbox Aymeric Laporte and John Stones were both absent from Manchester City's training session on Tuesday afternoon to give Pep Guardiola a concern.
City's manager is preparing for their first fixture in a tough Champions League group with RB Leipzig the visitors at the Etihad on Wednesday.
And he may have to do without two of his best three centre-backs if Laporte and Stones are not able to play after not being deemed fit enough to take part in training.
Ruben Dias was present at the City Football Academy, as was Dutch defender Nathan Ake; the two were paired together for the majority of pre-season and played at Wembley in the Community
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