"The party will utilise Modi's services...," Shettar told reporters after the party's foundation day celebrations here.
Modi will campaign in five districts, the Chief Minister said without elaborating. There are 30 districts in the state.
There has been speculation that Modi may not like to involve himself deeply in the May 5 assembly polls in Karnataka where the BJP is facing an uphill task in retaining its turf.
The Gujarat Chief Minister had skipped the BJP's Central Election Committee meeting yesterday that finalised 140 candidates for the Karnataka polls, but party leaders had sought to play it down, explaining he had prior engagements.
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Shettar said the party will release its second list of its candidates either on April 9 or 10.
BJP yesterday had announced candidates for 140 seats of the 225-member assembly that includes one nominated member. The list includes names of Shettar, Deputy Chief Ministers R Ashoka and K S Eshwarappa from their home constituencies.
Asked whether the party would give tickets to three legislators who had been in jail in connection with corruption cases against them, Shettar said the party is scrutinising their credentials.