The England defender, in superb form of late, had to be substituted in the final moments of the 2-1 win over the Reds and though his back injury has improved slightly, his fitness will be monitored as the week progresses.
“He has a disturbance in his back,” said Guardiola.
“Yesterday he was not good, today a bit better. We do not want to take risks so we will see.”
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Guardiola says he knows more or less what his starting XI against Inter is likely to be – though Walker’s availability could impact that – and the City boss says he is relaxed and ready for Saturday’s Champions League final.
“I am more than calm,” he said.
“I am so grateful for what the players have done. But finals are completely different. What I will do in the next days is try to understand the game we will play.
“Play as much who we are. But there will be a lot of difficulties. It is not easy to attack the defensive system that they use.
“We need to be patient. We have to have the right tempo. That is most important thing in this kind of game.
“As the game goes through you can be anxious and that would be a problem.
“They are used to controlling games in Italy. They have good patterns everywhere. And we have to defend really well.
“It’s a final against a top team and we have to do it. I am confident and so optimistic - but at the same time I cannot deny the difficulty of the opponent.
“Never have I done that and never in the final of a Champions League.”
