Celtic boss Brendan Rodgers is leaving no stone unturned in his quest for new arrivals at the club before the end of the window. Adam Idah is on the cusp of returning to Celtic Park after the Bhoys agreed a deal worth £8.5 million up-front for the Republic of Ireland international. An additional £1 million has been inserted in add-ons, while Norwich City also have a 15% sell-on clause. In among transfer chatter, free agent Renato Tapia has been linked with Celtic as Fluminese and Union Berlin look to capitalise on his lucrative status. Despite primarily operating in defensive midfield, the 29-…