The Tottenham manager told BBC Sport: "I think the first penalty after we scored made it difficult for us. We played 70 minutes when we were always in the game. Manchester City have very good players. The result was bad but there are a lot of positives to take.
"The first penalty for me was ridiculous but we need to accept the decision. We need to review the game, my feeling was it is not a red card [for Federico Fazio]. A lot of things happened. It's difficult to analyse. We always believed it was possible to get a point."
The home side were awarded three penalties in the match, two of which were converted by Aguero, while Hugo Lloris saved one.