The midfielder is taking part in training this morning, having sustained a shin injury.
Denise O'Sullivan could yet feature for the Republic of Ireland in Thursday's World Cup opener against Australia.
The midfielder is taking part in training this morning, having sustained a shin injury in last Friday's friendly against Colombia.
Ireland boss Vera Pauw says he has 'good hopes' O'Sullivan will play a part later this week, but that it's still too early to give a definitive answer.

Friday Morning Sports Update
Two Irish Athletes Hope To Compete For Medals At The European Athletics Championships
Celtic Complete Signing Of Mika Baur From Paderborn
Three Irish Teams Continue Their European Campaigns This Evening
Thursday Morning Sports Update
FAI Withdraws Support for Gianni Infantino as FIFA President
FIFA President Gianni Infantino Will Not Attend Tonight's Super Cup Final
Stuart Lancaster Confirms Mack Hansen Is Back To Full Fitness