The impressive results that included a winning run of four games earned him praise from the 'Mukwano Gwabangi' faithful and the sudden turn of events as a shock.
Vastly experienced tactician Alex Isabirye has repeatedly left Express FC after just two months in the seat.
The unconfirmed developments come after Express' 4-3 Uganda Premier League defeat at the hands of nemesis KCCA FC at their turf, the Muteesa II Stadium, Wankulukuku on Saturday.
The Red Eagles surrendered a 3-1 lead to the Kasasiro Boys, who struck thrice in the second half to win the tie.
At full-time, several Express fans attacked Isabirye and verbally insulted him, with many almost physically assaulting him, while others questioned his tactics, substitutions and approach in the loss to the 13-time league champions.
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With the game withering and with Express getting comfortable, Mugume levelled the scores at the 87th-minute mark.
And, apparently, Isabirye has told his bosses he will leave the role with immediate effect, as per reliable sources at Wankulukuku.
Meanwhile, this is far from certain, as neither the club nor the coach have yet to make a public announcement.
Initially, Isabirye joined Express in December on a one-month contract and impressed as he won four of the six games in that spell.
The impressive results that included a winning run of four games earned him praise from the 'Mukwano Gwabangi' faithful and the sudden turn of events as a shock.
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For Desabre, this small final will also be an opportunity to leave the competition favorably: “We have to leave on a positive note."
Meanwhile, in January, Isabirye was thereby rewarded a 'longer' contract, whose terms nor duration were made public.
However, he has yet to win a match in the second round, losing to Mbarara City FC (3-1) and KCCA.
Express currently sit eighth on the UPL log with 25 points in 17 matches, 12 off leaders BUL FC.
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Kitara have witnessed a sharp climb in the past two years, having also won the FUFA Big League (top-tier) last season.
It should be noted that Isabirye took over from James Odoch, who was shown the exit door by the club administration.