The Spanish midfielder has been at City since 2015, joining our academy setup from Villareal.
He went on to make nine first-team appearances, scoring once in an EFL Cup game away at Swansea in 2016.
He played two consecutive seasons on loan at Girona, before spending last season at Belgian side Mouscron.
He will now continue his career in the Romanian top flight.
Everyone at City would like to take this opportunity to wish Aleix all the best with his new adventure.