KCCA FC confirmed on Monday they had parted ways with Mutebi on mutual consent.
The club then announced Morley Byekwaso who was Mutebi’s assistant as the interim head coach.
This left Okello discontented and asked Mutebi not to retire from coaching.
“Can’t believe it, Good luck coach Mike Mutebi,” Allan Okello wrote on his social media pages after learning of Mutebi’s exit.
“Words can’t bring out all I can say now but all I can say is I hope you are not thinking of retirement.”
“Because there are many young players still out there that need your help.”
“Just know we love you so much, you made us what we are today,” he added.
Okello made his KCCA debut in 2007 under Mutebi’s guidance and since then he helped the club to several titles.
He went on to sign his first professional contract outside Uganda with Algerian top league side Paradou AC.