"We simply weren't good enough," he told the assembled press following BVB's first European defeat of the 2014/15 campaign. "We got off to the worst start imaginable. Arsenal deserved to win."
'We weren't thinking straight'
As Klopp went on to explain, Yaya Sanogo's opening goal was a setback from which die Schwarz-Gelben failed to recover, despite enjoying more possession (55 per cent) and registering as many shots on goal (nine) as their north London hosts. Alexis Sanchez's second-half strike merely concluded a decidedly off-colour team display.
"We weren't consistent enough," Dortmund's straight-from-the-shoulder tactician continued. "There were many occasions where we weren't thinking straight in the final third. When you don't play the right pass and the final ball is missing, logically you're not going to score. As always, we've got plenty of work to do."
'A lot on the line'
Fortunately, qualification for the last 16 is already in the bag, but Klopp's side still need a point against RSC Anderlecht on the final day to be sure of topping the group. Stopping the rot domestically nevertheless remains the number one priority in the interim, with the Ruhr district outfit currently sitting third from bottom after 12 league games.
"No one's thinking about Anderlecht," affirmed 25-year-old midfielder Sven Bender. "We're completely focused on [Sunday's] trip to Eintracht Frankfurt. There's a lot on the line for us, it's a really important game. We have to show we can pick up points in the Bundesliga. We have to be on it and show what we're made of."