By Jude Summerfield Chelsea are interested in Celtic midfielder Matt O’Riley as a potential replacement for Conor Gallagher, according to a report. It emerged on Friday that the Blues had warned Gallagher he faces a training ground ‘exile’ if he does not agree to a move to Atletico Madrid or another summer bidder, having turned down two contract offers from the west London club. Chelsea are interested in signing a new midfielder if Gallagher does depart and Celtic’s O’Riley is one of their main targets, according to Sky Sports. The 23-year-old scored 18 goals to power Brendan Rodgers’ side to …