The Chilean is preparing to face his former team in the Champions League but insists that while he loved his time with the Catalan giants he is now "so happy to be a Gunner"
The Chilean will face his former team for the first time in the Champions League when Luis Enrique's side take on the Gunners in the first leg of their last-16 clash at the Emirates.
Alexis spent three seasons with the Catalan giants before signing for Arsene Wenger's side in 2014, where he has become an integral player and he admits to being completely happy in north London.
He wrote on his Instagram: "I want to thank FCB, the doctors and the physiotherapists who cared for me during my stay in Barcelona and especially the players with whom I shared beautiful moments.
"But life carries on and my present is with Arsenal, my home, my family and I'm so happy to be a Gunner."