I'm sure Fat Sidney would like to keep his job, but can/will he?
If I'm the Yanks and Dotel is close, I'd wait for him and then dump Ponson.
If no Dotel, I'd find a different replacement for Ponson.
Unless you figure that Wright could go down at any time and you want a little extra insurance with a guy like Ponson who can also start - except that he's horrible.