He was though regularly subjected to racist abuse. Kasule and Thistle won the 1986–87 Scottish Second Division earning  promotion for the next season to the middle of Scotland's then three tiers in senior football. Thistle finished runners-up in the 1987-88 Scottish First Division missing promotion to the top tier by one place.
He was, nonetheless, frequently subjected to racist verbal abuse. Kasule and Thistle secured promotion to the middle level of Scotland's then three-tiered football structure through their victory in the 1986–87 Scottish Second Division. Thistle narrowly missed out on promotion to the top tier by finishing second in the 1987-88 Scottish First Division.