By Sean Walsh Real Madrid are said to be monitoring Valencia’s Yarek Gasiorowski in their search for a new centre-back. The European and Spanish champions had been hoping to strengthen in defence over the summer, with Leny Yoro their top target. However, the were reluctant to meet Lille’s demands and the teenage sensation wound up signing for Manchester United instead. Madrid’s lack of depth in central defence has been exposed already this season, with right-back Dani Carvajal having to fill in to make up for their lack of cover. AS report that Los Blancos are indeed back in the market for a c…