Pettinger leaves Imps
The former Rotherham ace was unhappy with his lack of first-team football at Sincil Bank and keen on a move away.
Pettinger had found himself third choice keeper at the club behind Alan Marriott and Darren Horrigan and recently spent a month on loan with Conference side Telford United.
A severance deal has been agreed for the player's contract to be paid up to allow him to find himself a new club.
Meanwhile, Imps defender Mark Camm has joined Unibond Premier League side Gainsborough Trinity on a month's loan.
Camm could be joined at Gainsborough by Pettinger with ex-City boss Phil Stant keen to bolster his goalkeeping options.