The full-back is out of contract in the summer, but has played enough games to trigger the option of an extension to his stay at Griffin Park.
The 23-year-old is keen to remain with the Bees, but Rosler has other irons in the fire.
Logan, a former Manchester City player, made 32 appearances for the club last season, scoring four goals.
"We are still in contact but both parties are exploring different avenues," Rosler told the Hounslow Chronicle.
"We know where each other stand and will make a decision in the next two weeks."