Michael O'Neill admitted the two dismissals ultimately cost Northern Ireland against Portugal on Friday.
Northern Ireland manager Michael O'Neill reflects on his side's defeat against Portugal in World Cup qualifying.
Steven Davis and Gareth McCauley give their reaction to Northern Ireland's defeat to Portugal.
Cristiano Ronaldo notched a hat-trick as Portugal came from behind to beat Northern Ireland 4-2 at Windsor Park.
Michael O'Connor is confident Northern Ireland can build on their win over Russia when they face Portugal.
Craig Cathcart has been ruled out of Northern Ireland's World Cup qualifiers with a knee injury.
Chris Brunt is back in the Northern Ireland squad for the World Cup quailfers against Portugal and Luxembourg.