Manchester City boss Pep Guardiola has been urged to sign two new centre-backs at the end of the season by hero Micah Richards.
City dropped points in a 2-0 defeat to Manchester United at Old Trafford.
The defeat leaves them on 57 points, 25 adrift of Liverpool with 10 games left in the season.
"If they want to be challenging next season, they've got a few little tweaks to make," Richards told Sky Sports. "It's just little tweaks. It's never as bad as you think, and it's never as good as you think.
"I think the centre-back situation needs sorting because I keep mentioning, in my opinion, Fernandinho isn't a centre-back; he's better in midfield. We miss him in midfield. I don't want to keep mentioning Kompany, but I have to - it doesn't look like we replaced him. Laporte's been injured as well.
"Otamendi - they were calling him 'The General' only 18 months ago. I don't know if he's got to an age where he can't move as well anymore, but he's not producing the same performances that we were seeing a couple of seasons ago. Stones has not played as much games as he would like. Has he lost the managers' trust? Probably. So yep, it needs sorting."
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