EXCLUSIVE from Graeme BaileyTBR Football understands Arsenal, Chelsea and Manchester United are all showing an interest in landing Barcelona’s defensive starlet Pau Cubarsi. The 17-year-old centre-half is the latest graduate of the famed La Masia academy to make his first-team breakthrough this season and he has featured in nearly 20 games for Xavi’s side this term. Sources have confirmed to TBR that a host of sides have been checking on Cubarsi’s situation and via intermediates, Arsenal, Chelsea and Manchester United have made their interest known to the teenager’s camp. Arsenal make contact …