Keane initially found life in Nottingham difficult due to the long periods away from his family, and he would often ask the club for a few days' home leave to return to Cork. Keane expressed his gratitude at Clough's generosity when considering his requests, as it helped him get through his early days at the club. Keane's first games at Forest came in the Under-21s team during a pre-season tournament in the Netherlands. In the final against Haarlem, he scored the winning penalty in a shootout to decide the competition, and he was soon playing regularly for the reserve team. His professional league debut came against Liverpool at the start of the 1990–91 season, and the resulting performance encouraged Clough to use him more and more as the season progressed.