Iain Henderson admitted Ireland weren't clinical enough as they beat Georgia in their last Group A game of the Autumn Nations Cup.
Andy Farrell's side crossed for two first-half tries, but couldn't build on it after the interval as the visitors proved a hard but to crack.
Billy Burns went over on his first start for Ireland, while Hugo Keenan added the second, but the team went 25 minutes without a score in middle third of the contest.
"We're creating opportunities but we're not taking them - that was the story again today," he told RTÉ Sport afterwards.
"Several times we got over the line but we're just not executing where we need to in order to get two or three more tries.
"They were never going to give up, and we saw that at times in the second-half there they were really going hard after us.
"For us - frustrating. We've got to work on our execution and our finishing. If we nail a couple of those opportunities, you never know, it could be a different story for us in the second-half."
'We're creating opportunities but we're not taking them - that was the story again today'— RTÉ Sport (@RTEsport) November 29, 2020
Iain Henderson, man of the match, and James Ryan speak after Ireland beat Georgia at the Aviva Stadium #RTERugby pic.twitter.com/hQJxPntTQY
Ireland will play Scotland on Saturday to decide who comes in third and fourth place in the competition.
There had been nine changes from the team beaten by England last week, and captain James Ryan added that the performance was short of where they would have wanted it to be.
"A bit scrappy, probably not the standard of performance that we're looking for. I thought we started really well - the first-half went well.
"The third quarter we didn't get to where we wanted. Second-half they fronted up really well. It was such a physical encounter and that's probably reflected in the injuries and the knocks out there today.
"A couple of calls we were probably unlucky with in the second-half, but all-in-all I was pretty happy with the scrum.
"We'll have to step it up next week."