The pair have dropped down the pecking order in attack following Sven-Goran Eriksson's summer spending and were unlikely to feature in the City first team over the next few months.
Corradi has returned to Italy on a season-long loan deal with Parma while Dickov has joined Championship side Crystal Palace on a four-month loan deal.
The previous day Mills secured a four-month loan deal with his former club Charlton, and will play alongside former Blues Nicky Weaver, Ben Thatcher and Paddy McCarthy.