Manager Avram Grant is reluctant to have just 17-year-old Rhys Taylor as cover and could make a shock move for Valencia veteran Canizares, who was sacked by boss Ronald Koeman last week.
In January, when Cech and Cudicini were both out, Chelsea took former Celtic and Coventry keeper Magnus Hedman on a short-term contract as cover, although the Swede never actually played.
Canizares, 38, who played against the Blues in the Champions League in October, is a free agent and while the keeper, capped 46 times by Spain, had suggested he would never join another club, the possibility of a last half season at a top-level club might appeal.