The Reds will now host the Bundesliga club in the second leg of the tie at Anfield on February 25 having struggled to really get a foothold in the clash at the WWK Arena in Bavaria.
"We had a few chances, but I can't say I am particularly happy," said Klopp.
"There's no point getting carried away, 0-0 away from home isn't a bad result, but we still have a lot of work to do.
"We didn't really get our pressing game going, we didn't get into our rhythm and failed to impose ourselves in midfield.
"There were a lot of things we could have done better."