The report says O’Neill had surgery on his left ankle, while Trewin underwent an operation on his right. Their absences affect different parts of the team: O’Neill has been used in midfield, while Trewin provides defensive cover.
Those numbers underline the wider impact. NYCFC are not only losing bodies; they are losing recent production from midfield and defence at the same time.
Both players reportedly sustained their problems after representing Australia. O’Neill started all four of the nation’s World Cup matches, while Trewin also featured against Egypt.
That international workload does not establish a direct cause, but it makes the timing especially difficult for a club managing a demanding MLS schedule. Without estimated return dates, the coaching staff cannot plan confidently around either player’s recovery.
NYCFC’s immediate solution is likely to come from internal adjustments. The midfield may need a different balance without O’Neill’s passing, while Trewin’s absence could force changes to the defensive rotation or shape.
The lack of a timeline also complicates recruitment decisions. A short-term absence can be managed with depth; a longer layoff may require the club to consider reinforcements in the next transfer window.
The next run of MLS fixtures will show whether NYCFC can absorb both losses. Until clearer medical updates arrive, O’Neill and Trewin’s recoveries remain the club’s central storyline.