Brendan Rodgers has shared what he told Mikey Johnston after the Celtic winger asked to leave the club last summer. The Celtic boss allowed Johnston to go out on loan in January to West Brom and, to be fair to the winger, he has lit up the English Championship. But it seems that Johnston wanted to leave sooner than that but Rodgers has told how he set the 24-year-old a challenge before he allowed him to go and seek first-team football elsewhere. Rodgers said [The Herald], “Brilliant. I’ve said before about Mikey’s talent. He has been here a long time. Listen, the shirt is a different weight of…