Rangers galvanised ahead of Celtic double-header after stoppage time winnerDerek McInnes believes the galvanising nature of Rangers’ late, late winner against St Mirren should imbue his squad with confidence ahead of Sunday’s Premier Sports Cup clash with Celtic.Bojan Miovski’s injury-time strike led to widespread celebrations on the pitch, on the touchline and in the stands as Rangers won for a fourth game in a row to remain five points behind their rivals.McInnes, who revealed both Lawrence Shankland (hamstring) and Daisuke Yokota (groin) would have operations in London on Thursday that will keep both out for several months, felt his team were worthy winners based on the number of chances created – and spurned – in the first half.The Rangers manager did admit that St Mirren had been the better team for a 20-minute spell after the break but felt the nature of Miovski’s winner would help to raise spirits ahead of the first half of the Old Firm double-header.Rangers’ Bojan Miovski celebrates scoring his stoppage time winner against St Mirren with manager Derek McInnes. (Photo by Rob Casey / SNS Group)…