The Argentina global, who is the Premier League's top scorer with 19 goals, missed City's 2-0 victory over relegation-threatened Cardiff City on Wednesday and was a doubt for Saturday's semi-final at Wembley.
Despite the win, Guardiola said his side, who had 11 shots on target, needed to be more clinical.
Everton and West Ham may not be involved in the Champions League race but they will have a significant influence on the final standings - they each have three of the four contenders still to play. Hazard warned the academy graduate from believing too much of his early hype, saying: 'I think the guy was waiting to start a game in the Premier League but he is ready.
Having also reached the semi-final of the 2018 World Cup in Russia, England's performances certainly haven't gone unnoticed.
"I want to do what I can and play at my best level but I won't compare myself to a year ago when I played 70 games and was on such a roll".
There is an argument that playing against teams scrapping desperately against relegation is tougher, at this stage of the campaign, than taking on mid-table sides with little to motivate them.
"Tottenham I think will be alright but Arsenal I think will miss out".
With the League Cup already in the bag, City are struggling to quell growing talk of a historic quadruple even as Guardiola attempts to keep his players' feet on the ground.
"I could have done a lot better this season", he told the Standard. "I don't know, because only one team can win it but you have a chance to do well in the next ten years".
As the final 20 minutes approached, Foden hooked against the post from a corner and the same player's swerving drive was superbly tipped away moments later.
Asked if he had decided who would play at left-back, Guardiola said: "I've nearly decided but of course I can't (tell you)". Mendy alone can not help us arrive in the end of April with the challenge of winning something more.
"Will they win it?"