Arsenal were held 2-2 on Thursday by Sporting Lisbon in an entertaining Europa League last-16 first leg.
The performance by the Gunners have prompted comments from Arsenal manager, Mikel Arteta who said his side must “improve massively” if they are to continue winning games.
With a superb header, France defender, William Saliba put the Premier League leaders ahead before Sporting took advantage of poor defending to score either side of half-time through Goncalo Inacio and Paulinho.
The result for Arteta was not encouraging, since the Gunners conceded two goals for the second successive game.
“It’s true that it’s something that we must improve massively if we want to keep winning games,” said the Spaniard.
“When you concede two poor goals like we did away from home in Europe it’s very difficult to get a positive result.
“We gave too many simple balls away. We need to defend our box much better.”
Interestingly, Arsenal had a chance to take a lead back to London but Fabio Vieira’s header was kept out by Antonio Adan.
