The 24-year-old has failed to make the expected impact at Leeds since joining the club in 2008.
Grella spent time on loan at Carlisle and Swindon Town last season.
The New York-born striker was transfer listed by Leeds in May.
The 24-year-old has failed to make the expected impact at Leeds since joining the club in 2008.
Grella spent time on loan at Carlisle and Swindon Town last season.
The New York-born striker was transfer listed by Leeds in May.
