was again at Ibrox as the side again beat Aberdeen. The final came just a fortnight after the sides met in the league. Rangers lost 2–1. During the game, Aberdeen's Neil Simpson's tackle on Rangers midfielder Ian Durrant left the latter with a knee injury that kept him out for over three years. But for a single-goal defeat by Celtic in the 1989 Scottish Cup Final, the treble would have rested at Ibrox that season. The arrival of businessman David Murray in 1988 continued the Rangers resurgence. Murray had acquired Rangers for £6 million from the Nevada-based Lawrence Marlborough on 23 November 1988. Murray officially became chairman on 2 June 1989, replacing David Holmes. Murray retained the ambitious strategy he had inherited from Holmes. This was demonstrated on 10 July 1989, when Rangers, acting on Souness' wishes, purchased former Celtic striker Mo Johnston from Nantes for £1.5 million. The fact that Rangers signed an ex-Celtic player would have been a big enough story, but Johnston was also a high-profile Roman Catholic. The transfer angered both sides of the Old Firm support. Rangers, seen as the Protestant club in Glasgow, had a policy of not employing Catholics. Celtic fans saw Johnston as a turncoat who had already committed to re-join Celtic from Nantes before Rangers made known their interest. After three matches in the league, Rangers had no wins and two defeats. New arrival Johnston netted the crucial winner during an Old Firm game on 4 November 1989. Scoring the goal in the dying minutes of the match meant Johnston was all but forgiven by the Rangers support. Come May 1990, Rangers' name was on the trophy for the second time in as many seasons, but the club again failed to win the Scottish Cup, losing to Celtic in the fourth round. The side lost to Aberdeen by 2–1 in the Scottish League Cup Final. The 1990–91 season would be Souness's last in charge. On 16 April 1991, he departed for his former club Liverpool before the league campaign reached its dramatic culmination, saying he had "gone as far as he would be allowed to go". A final-day victory over Aberdeen at Ibrox gave Rangers three championships in a row. Souness' assistant Walter Smith was in charge that day. Before his departure, Souness sold club captain Terry Butcher and spent big money on striker Mark Hateley, winger Pieter Huistra and forgotten