They made the DL in Canon fit too.
Sigma make two versions of the 70-300mm. The DL and the APO. The APO is quite a bit sharper than the DL - new price of the DL is usually under £100.
Unless it is the correct fit and very cheap, I'd steer clear. You can get a Canon 55-250mm used for not much more than £100 and that is a far superior lens.