By Jamie Spencer Bayer Leverkusen midfielder Exequiel Palacios has admitted he is proud to know Barcelona are showing interest in him ahead of the summer transfer window. Palacios played a key role in both Leverkusen’s maiden Bundesliga title and run to the Europa League final this past season, forming a solid central partnership with Granit Xhaka. His contributions, like so many of the squad moulded by Xabi Alonso, haven’t gone unnoticed by bigger sides and Barca have been linked as they search for an upgrade on Oriol Romeu in midfield. “It is a pride that a big club like Barca pays attention…