Speaking afterwards, O’Neill told RTE Sport: ‘Seamus went for a scan. He has a little stress fracture, which is a concern. He could easily have got a flight home, but he stayed with the team.
Martin O’Neill has revealed Seamus Coleman suffered a broken foot in the defeat by Wales
‘He is a great captain, a really great captain. He is inspirational and obviously we hope he is back in time for the games coming up.’
Ireland host Denmark and the Welsh in Dublin next month with their opponents already having a win each on the board.
Coleman spent 10 months on the sidelines after suffering an horrific double leg fracture in a 0-0 World Cup qualifier draw with Wales at the Aviva Stadium in March 2017.
In his absence, a new-look Ireland side were minutes away from a morale-boosting win against Poland.
The Everton full back has only recently returned from 10 months out with a broken leg
Striker Aiden O’Brien marked his debut with a goal, and O’Neill was pleased with the Millwall man’s display.
He said: ‘I thought Aiden O’Brien was terrific for a debut. We knew what we’d get in terms of effort from him. He doesn’t always play for Millwall, but when he does, he gives you everything.
‘He hasn’t played centre-forward for a long time – he plays left midfield. But he attempted to hold it up for us and gave us strength and brought others in.’