Sheffield Wednesday ace has signed for Belenenses.
Sasso leaves Sheffield Wednesday with his 12-month deal set to expire.
Sheffield Wednesday are set to re-shape their squad ahead of another season in the Championship.
Sheffield Wednesday have a number of players whose permanent contracts expire this summer.
The Frenchman was sent off as Wednesday lost to Aston Villa.
The Frenchman believes his side are better, despite losing twice to Leeds this season.
Sasso is out of contract at Sheffield Wednesday this summer.
Sheffield Wednesday were beaten 2-1 by Brentford nine days ago.
Sheffield Wednesday were beaten by Redfearn's old side Leeds United on Saturday.
Players from Leeds United, Sheffield Wednesday, Birmingham City, Rotherham United, Huddersfield Town, Cardiff City and Fulham are all vying for the win.