"I was fit enough 100 per cent," said Stones.
"It comes down to various things, the manager Guardiola and that's something I can't control and I think it's always difficult to pick an XI and I say this to him."
Stones clarified that his desire to contribute on the pitch remained unchanged despite the decisions made by the coaching staff.
"He knows how much I wanted to play, how much I wanted to be there and you can look at it in so many ways.
I think I feel as good as I've ever been before a tournament," added Stones.
According to BBC Sport, Everton and AC Milan have been linked with securing the veteran defender on a free transfer, alongside other high-profile unattached World Cup stars such as Mohamed Salah, Casemiro, and Luka Modric.
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England is scheduled to face Mexico on Sunday in the round of 16 knockout phase.
