The Italy striker opted to make the switch to the St Mary's Stadium in January after a frustrating two-year period at Napoli in which he was largely consigned to a bit-part role.
Gabbiadini scored four Premier League goals in 11 appearances and was also on the scoresheet twice as Saints lost the EFL Cup final 3-2 to Manchester United.
The 25-year-old believes playing regularly for Southampton will help his ambition to represent the Azzurri in next year's World Cup, but admits the chances are he will play in Serie A again in the future.
"I have no regrets, they were two wonderful years. When I think about my experience at Napoli, I'm satisfied with what I did there," Gabbiadini told ANSA.
"Sooner or later I will return to play in Italy but not now. I am happy in England, where I am playing in a great league.
"And given the competition in attack for Italy, I can have more opportunities in view of the World Cup in 2018."