Zaheer was the Bears' first choice, but he could not commit for the required period

Bond is set to miss the first two months of the domestic campaign because of international commitments with New Zealand.

And Zaheer, who enjoyed a good World Cup, was the Bears' first choice as cover.

But operations manager Keith Cook told the BBC Sport website on Monday talks with Zaheer had broken down.

"We got to the stage of discussing a contract with Zaheer Khan, but similar to Shane he could not commit because of international duty," he said.

"We need a player to be available for five championship and seven one-day matches while Shane is away, and Zaheer felt he would be unavailable for two of the four-day games.

"We are looking at two other players, which I won't name, but we are closer to making an offer and should be ready to name somebody by Wednesday."

Bears halt Hogg bid

Warwickshire have also ended their bid to sign Australian spinner Brad Hogg.

Hogg had been targeted as the side's second overseas signing but has been ruled out of contention after being selected for his country's tour to the West Indies.