Transfer interest is building around Ruben Sanchez Saez, with Charlton understood to be weighing-up a move for the Espanyol midfielder. While there has been no official bid as yet, the club may act swiftly if they decide to pursue the deal before the transfer window slams shut. PAOK and Elche have not withdrawn their interest and could still influence the outcome. By bringing in Ruben Sanchez Saez, Charlton would add another option to balance the squad and support throughout the season. Espanyol have recently been linked with Issiaka Kamate, Unai Nunez and Jan Carlo Simic while Charlton have had no rumoured targets. Stay tuned for more details as the story develops. Need more Charlton transfer rumours? Follow @PlayerSwitchCom on Twitter for news and updates as they happen.