The problem has been that the sponsors of Ganguly's bat -- Apollo Munich - is not a registered bat sponsor with the International Cricket Council.
Yesterday, Ganguly pleaded guilty to a Level 1 offence (Article 2.1.1) as per IPL's Code of Conduct as a breach of the Clothing Regulations.
"The players can only use those bat stickers which are registered with the ICC.
For example, although Hero Honda or MRF do not manufacture bats but they are registered sponsors under ICC and players are free to use their stickers. Apollo Munich is still not registered and till it is done, Ganguly can't use the sticker on his bat," an IPL official told PTI today.
The Pune Warriors management are trying to get in touch with the ICC in order to register the name of the company so that the former India captain can use his sponsor's sticker on the bats.