The 54-year-old coach, who was sacked by the Nerazzurri back in September, believes that his old club have just lost a player of the highest quality
The midfielder joined Paris Saint-Germain on transfer deadline day - in spite of the fact that coach Claudio Ranieri was desperate to hold on to the Italy international.
The Roman's predecessor has now revealed that Motta's departure has been on the cards for some time now.
"Last summer, Inter wanted to sell him, but I insisted that he stay," Gasperini told L'Equipe.
The 54-year-old coach now believes that the Nerazzurri have lost a player of the highest quality.
"Congratulations to PSG: they've made a very good choice," Gasperini added. "Motta is the best midfielder in Italy along with [Andrea] Pirlo and [Claudio] Marchisio."
Motta played a key role in Inter's treble success of 2010 but was aggrieved by the club's failure to offer him a new deal last summer.