Writing on his Twitter page, McFadden said: "If I'm to be honest yes I would love to do an album with boys and show JLS and Take That what we are really made of.
"If the boys wanna challenge these newcomers I am always up for a fight. They know where. I am. Armed and ready to reclaim glory!
"The reason I'm feeling like this is I watch my boys release an incredible emotive song and video and it play third fiddle to average."
However, any return looks unlikely after Westlife member Nicky Byrne commented: "He's been out of the band for nearly seven years and I couldn't see him fitting in now.
"We've done more tours without him than Robbie ever did with Take That and we didn't split up after he left. It'd be great to get on stage and do a song with Brian for the fans, but I couldn't see him rejoining."