Celtic manager Brendan Rodgers has urged his players to stay focused and hard-working this summer as transfer rumours surround the squad. The Bhoys have yet to do any serious business in the current window, though rumours and reports are ramping up. Italian side Atalanta are thought to have lodged a bid for midfielder Matt O’Riley which was rejected by the Scottish champions. Meanwhile, multiple clubs are chasing striker Hyeongyu Oh as Celtic consider a move for last season’s loan hero Adam Idah. It can be a destabilising time and Rodgers has acknowledged there are a few distractions behind-th…