Sidders made just seven starts for the Blues since his free transfer from Reading last summer.
Overlooked by Mourinho, Grant and just about everyone else, the all-action player will head to the Midlands where he is expected to replace Liverpool-bound Gareth Barry.
Cheers Sidders, you will get a good reception when you come to the Bridge this season.
It makes a change for Chelsea to actually make money on a transfer. Hopefully the cash can now be ploughed into the coffers to secure the Chelsea futures of Frank Lampard and Didier Drogba.