Sukhdev's arrival completes Mohun Bagan's squad with 25 players.
According to the media statement, the signing of Sukhdev was kept under wraps as arch-rivals East Bengal were also keen on his signature.
"Previously, we had shared the names of 24 players and intentionally kept the name of Sukhdev under wrap, as he was also under the radar of Kingfisher East Bengal," the statement read.
Sukhdev, 26, played a pivotal role in Minerva's I-League triumph this season.
Mohun Bagan finished third in the I-League table this season with 31 points from 18 games, four short of Minerva who upset all odds to be crowned surprise champions.
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