 Bob had rated Slater highly ever since a friendly between the two brothers' clubs in 1960 so when he became available Bob made sure he got his man paying £2,500 for Slater's services.Slater first introduction to European football was at Dens Park against Cologne, Dundee were 5 up by half-time and went on to win 8–1, Cologne only got the 1 because of an own-goal by Alex Hamilton.Cologne lost their keeper to injury at half-time.