Mikey Johnston’s future at Celtic appears to be nearing its end as Burnley and West Brom battle it out to sign the Republic of Ireland winger. Johnston enjoyed a storming temporary spell on loan at The Baggies last season as he wowed The Hawthorns crowd with some stunning performances as his seven goals and two assists helped put West Brom into the Premier League play-off places. However, it seems that his Celtic career is all but over as a report in the Express and Star says Mikey Johnston has agreed on a £3m move to West Brom with a medical set ahead of signing a four-year deal. Johnston say…