Siem de Jong's winning goal may have come at considerable cost as Sydney FC beat Wellington Phoenix 1-0 to maintain their push for the A-league lead.
The Sky Blues' seventh win in their past eight games lifts them within a point of Perth Glory but coach Steve Corica's immediate concern will be the fitness of marquee man De Jong.
The former Netherlands international was injured in the process of scoring his 25th-minute goal from close range, writhing for several minutes on the goal line holding his left knee.
Corica's concerns stiffened soon afterwards when midfielder Anthony Cacares hobbled off with an apparent calf complaint, continuing a patchy campaign for the Manchester City loanee.