The 24-year-old forward made an immediate impression on his senior international debut, scoring a brilliant solo goal to seal a 2-1 victory over Madagascar in Nigeria's opening match of the series.
Although Usor was unable to reproduce that performance in Nigeria's subsequent encounter against Guinea-Bissau, where the Super Eagles suffered a 3-0 defeat, his debut display was enough to strengthen his chances of retaining his place in the squad for the back-to-back fixtures against Tanzania in November.
However, an injury setback has put his availability for the crucial qualifiers in doubt, Owngoalnigeria.com reported.
Usor sustained a shoulder injury that saw him miss LASK's 3-6 defeat to Liverpool in the UEFA Champions League, raising concerns about whether he will recover in time to join the Nigerian squad.
The publication's sources have indicated that the forward does not require surgery, offering some hope that he could return to action without undergoing an operation.
His chances of featuring against Tanzania will, however, depend on how well he responds to treatment and his recovery over the coming days.
The timing presents a concern for Nigeria, with the recovery period potentially extending towards the first leg, when the Super Eagles are scheduled to host Tanzania in Uyo next month.
Nigerian international Alex Iwobi believes Fulham can build momentum after ending their winless start to the Premier League season with a 1-0 victory over Hull City at Craven Cottage on Saturday.
Ghana are expected to turn to Black Queens head coach Kim Lars Bjorkegren to help rescue their 2027 Africa Cup of Nations qualifying campaign when they face Somalia in a November double-header.
Coventry City manager Frank Lampard revealed Nigeria striker Taiwo Awoniyi is available for selection for his sides clash against Tottenham Hotspur on Monday.
AC Milan and Nigeria forward Samuel Chukwueze is doubtful to feature in the Europa League group phase clash against RB Salzburg on Thursday due to fitness issue.
