Chelsea were wrong to let Man City sign Mateo Kovacic.
The Blues have embarked on a sale of several first-team stars this summer in order to comply with Financial Fair Play.
Chelsea decided to sell Mateo Kovacic to Man City who had just one year left on his contract for £25million.
He has been pivotal for the West London club since his arrival from Real Madrid and Ferdinand believes Chelsea made a blunder by selling him to the league champions.
Ferdinand said: “Man City, Kovacic is a great signing. Obviously they’ve lost Gundogan, the captain, but I think Kovacic is a shrewd signing, at that price as well.
“I think he was £30m and in the current market, that’s huge business, great business. He’s full of experience, won the biggest trophies, and a different player to what they have got in that area.
“He can travel with the ball through the lines, so I think he’s a good signing. I think they’ll go again, City, somewhere else [in the squad].”