He said: “We started very well, and had a big chance to go one-nil up; we looked very good and I was very confident.
“We made a few mistakes for the goal, and obviously it was a great shot so the goalkeeper couldn’t do anything about it.”
The dismissal of Jake Reeves midway through the half was a big talking point in the game and Rösler conceded that the tackle was avoidable.
“We have young players and they will learn; Reevesy is young player with a relatively old head on his shoulders; he’s a very good learner and he will definitely not do that twice.
“I think when you go in over the ball you have to expect that the referee can give you a red card.
“I would say it was still harsh but the rules are the rules and when you go in like that it’s unnecessary.
“It was a bad first touch and he’s shown frustration; you can’t do that, you have to keep your head.”
Rösler switched formation at half time, with Weston on the wide left and Logan on the right, which appeared to gave The Bees some impetus.
“It was the right decision to play 3-4-2 [in the second half] to put more pressure on them and we were in the game until the last minute and unfortunately it wasn’t enough to get the equaliser.”
With injuries affecting his first choice line-up, Rösler was confident that a core group of players would be ready for the opening league match at Bury.
“The good thing is that Farid will be fit next week, Toumani trained now for two days after being out for two weeks, he will be available and hopefully we will bring in a left back by then so I’m very optimistic for next Saturday.”