You may not be able to sponsor him given the facts you alleged unless his last employer will issue him an NOC or a waiver of sponsorship in your favor.

Your friend needs to wait for 2 years after the cancellation of his last work visa before he can be issued another work permit. Your friend's only option is to reenter Qatar under a business visit Visa.

The amendements of the new Sponsorship Law, as reported, is now under final review and will be approved by the Government soon. The amendments sought to be introduced will increase the waiting period from 2 to 5 years before reentry under Work Visa is allowed.