The 28-year-old Everton full-back remained in hospital in Dublin on Monday two days after undergoing surgery to pin the tibia and fibula in his right leg.
The bones snapped in a challenge by Wales’ Neil Taylor during the previous night’s 0-0 draw at the Aviva Stadium.
And O’Neill was asked about Coleman during his pre-match press conference for Tuesday’s friendly against Iceland.
“I think he’s just beginning to come to terms with it. I saw him yesterday and he’s still pretty down about it,” O’Neill revealed.
“He’s not in as much pain, the operation went very well and it’s just a matter of coming to terms with it.”