The Portugal Under-21 international has made only three appearances in the last 12 months since joining from Sporting Lisbon on a three-year deal last summer.
Rosado's final outing for Rovers came in the FA Cup win at home to Bristol City in January while his second and last league match was in the defeat at Middlesbrough on Boxing Day.
He spent part of last season on loan at Benfica's B team, scoring four times in 12 appearances, and has been deemed surplus to requirements by boss Gary Bower (pictured).
- Sports & Recreation
- Sporting Lisbon