Arsenal manager Mikel Arteta was left disappointed with his stars for not taking enough care of the ball as his side bowed out of the Europa League on Thursday.
The Gunners looked to be en route to the quarter-finals initially after Granit Xhaka had given them the lead. Pedro Goncalves equalised with a stunning effort from the half-way line.
Scores remained level from then until the end of the titanic tie before Gabriel Martinelli saw his penalty saved in the shootout as Sporting sealed their progression. Arteta was hugely critical of his side for their showings for the vast majority of the game as he attempted to come to terms with the exit.