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Luke Norris has completed a move to rivals Swindon Town.
An undisclosed fee has been agreed between the two clubs, believed to be around the £150,000 mark.
A bid for Norris, 23, was received last week and Gillingham left him out while he held talks. Swindon came in for the striker once it became apparent he was available.
Those talks have now resulted in Norris agreeing a three-year deal at the club. He isn't available for this weekend's game for Swindon, however, as the signing wasn't completed in time.
Norris could make a swift return to Priestfield with Swindon playing Gillingham on Tuesday, August 16.
Norris joined the Gills from Brentford two years ago under former boss Peter Taylor, with a fee eventually being paid after the two clubs agreed an undisclosed compensation figure.
He was in the final season of a three year deal and moved after making 70 league appearances, 32 of which came off the bench, scoring 14 goals.
Gillingham bolstered their strike force with the loan signing of QPR's Jay Emmanuel-Thomas and he starts the season opener against Southend.