But he is confident his troops will finish the job in Masindi.
The three-nation preparatory event, due on March 17-21, will involve Uganda, Zambia and Mali.
Saidi Kyeyune has made the list after tremendous performance in the league.
Emmanuel Okwii and Fahad Bayo score as Uganda beat Malawi 2-0 at Namboole Stadium to go top of Group B of the 2021 Africa Cup of Nations qualification....
Uganda hopes to qualify for the Africa Nations Cup finals for the third consecutive time.
Thirty-four-year-old McKinstry has coached in Africa, Europe and Asia.
Sign up to receive our free newsletter