The 30-year-old star left the boy band in 2004 to pursue a solo career but has told his Twitter fans that he would love to sing with them again.
Westlife's new single Safe recently entered the UK singles at number 10 with other boy bands such as McFly, Take That and JLS charting higher.
He recently wrote on his Twitter page: 'I had a dream tonight I was back on stage with westlife playing some crazy sized flootball [sic] stadium. I'm not gonna lie! I woke up smiling.
'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. Thay know where. I am. Armed and ready to reclaim glory!'
He later added: 'The reason I'm feeling like this is I watch my boys release an incredible emmotive song ang video and it play third fiddle to average.
'When will folk [give] them the credit they deserve. They are not xfactor band. They hard working creative machine who sacrafised a lot to get here.
'They will always be my brothers. No matter what happens I will support them til the day they hang up the mikes.'