"You always say the best team wins the league and City were the best team last year," the 37-year-old told Sky Sports
"The football they played for the most of the season was fantastic. As much as I don't want to admit it, they were good to watch and probably played the best football.
"So from that aspect, they were the best team and deserved to win it. They have raised the bar and it's up to us to now kick on and do even better than they did.
"It's always a motivating factor when you lose the league and perhaps we will be motivated even more after what happened.
"It isn't nice when you see another team winning the title on the last day of the season. You have that picture in your head of them celebrating and you don't want it to happen again.
"I still don't really understand what happened.
"We should have won the league and we didn't. In the end, we failed. To be in the position we were - eight points clear with six games to go - well, it's not like us."