Celtic’s need in the transfer window has never been so apparent as it has been this season. A raft of injuries to key first-team players not only exposed Celtic’s squad depth weaknesses but also highlighted the lack of quality brought in during last summer’s transfer window. And now that the league title race is almost at its end, the Celtic boss will be looking forward to planning for next season and getting the quality players he believes will help take us forward in Europe. Celtic target ‘looking forward to the future’We discussed last month how Jake Clarke-Salter was wanted by Celtic. Rodg…