Before getting disqualified, Mr Shankar was an Independent MLA from Ranibennur.
Karnataka Chief Minister BS Yediyurappa on Friday said he promised R Shankar, one of the 17 disqualified MLAs in Karnataka, a ministerial post in the state cabinet.
Leaving out Mr Shankar, BJP on Friday chose Arun Kumar Guttur as its candidate from Ranibennur Assembly constituency for the upcoming Karnataka by-elections.
Before getting disqualified, Mr Shankar was an Independent MLA from Ranibennur.
Unhappy with the party's decision to field Mr Guttur, supporters of Mr Shankar protested in front of BS Yediyurappa's residence.
"I spoke to R Shankar, who won from Ranibennur. He agreed that he will work for the candidate whoever may contest. I have promised him that he will be made MLC and a minister. Arun Kumar Guttal will be given ticket and he will win. R Shankar will work for Arun Kumar... We have convinced him. People will accept him after the situation becomes calm," Mr Yediyurappa said.
The by-elections for 15 Assembly constituencies in Karnataka will be held on December 5.