In the final PCB list of players who have been released by their franchisees, Karachi Kings also released West Indian all-rounder Kieron Pollard.
Gayle had switched to Karachi after appearing for Lahore Qalanders franchise in the first edition.
Interestingly Sangakkara had captained the Karachi Kings outfit in the last PSL but couldnt guide them into the final.
Karachi, in a major trade-off, signed on flamboyant all-rounder Shahid Afridi and he is expected to captain them in the third edition in February-March, 2018.
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All the five franchises in the PSL were required to release 10 players, two in each category including foreigners to allow the new entrant franchise Multan Sultans to sign on 10 players next week.
In other releases, Quetta Gladiators have let go of Pakistani opener Ahmed Shehzad while Lahore have released Pakistani batsman Azhar Ali.
Bangladesh opener Tamim Iqbal has also been released by Peshawar along with English batsman David Malan and Eoin Morgan.