The League Cup was won by defeating Celtic 2–1 after extra time. Goals from season new boys Davie Cooper and Gordon Smith completed the first leg of the treble. The 2–1 1978 Scottish Cup Final win over Aberdeen made Wallace the only Rangers' manager to win two domestic treble's. Surprisingly despite this unprecedented success Wallace resigned from his position on 23 May 1978. The reason for his departure was never revealed but it is widely believed that a breakdown in the working relationship between Wallace and general manager William Waddell was the cause. At a time when Ibrox Park was undergoing extensive redevelopment the transfer budget was to suffer. Waddell was suspected of vetoing many signings, Alan Hansen from Partick Thistle and David Narey from Dundee United among them, in favour of investing in the rebuilding project.