The hosts had two late opportunities to secure victory, but the Lions survived to claim a win in the first Test.
"It's very disappointing. We were right in it and a couple of errors and ill-discipline allowed them to get a leg up. In that first half, we didn't have a lot of ball and the ball we did have we made the most of so that will give us a lot of confidence," he told Sky Sports News.
"At the end of the day, we've got to be more clinical and make more of our opportunities. I thought our set piece was very good. We really grew at scrum time. We've done a lot of work on it over the last couple of weeks.
"They went hard at the breakdown. A couple of times we were a bit slow to get in there so that's something we've got to be aware of next week."
The second Test will take place next Saturday.