Pep Guardiola says that the double substitution of his centre-backs at Peterborough was down to injury.
The Manchester City manager took off Ruben Dias and Nathan Ake and sent on John Stones and Aymeric Laporte in the second-half as the Blues eased into the FA Cup quarter-finals with goals from Riyad Mahrez and Jack Grealish.
It looked like it might be a pre-planned move but Guardiola revealed afterwards that Dias has an injury problem just five days before the Manchester derby, and that Ake had also hurt himself in a hefty fall, although both seem to have been precautionary rather than anything serious.
