"It was obviously a disjointed and disappointing performance and we didn't show enough character but I think it's good for us before an international tournament," he told Channel 4.
"I think we've got to be better without the ball. I think that there were a lot of reasons for that and across the two games we probably haven't had our full side out across any two games. We've been able to look at people, we've been able to learn about the balance of the team.
"I've been involved in a lot of last matches leading into a tournament. Inevitably players have one eye on what's coming in terms of early challenges. No excuses on the result but there are a lot of things we can put eight quickly."
Asked if his team are ready for the competition kicking off, Southgate added: "We'll be ready. Tonight hasn't gone as we would have hoped. I said to the players that not every day will go as you want and tonight was one of those. But also not everything will be wrong, we had enough chances really to win the game but we conceded too many chances as well."