It was a very sad result for Arsenal and I never thought they would lose this game. Actually, their performances weren't too bad, but Sporting didn't play badly and they were able to finish this match in a draw. They also managed to win the game on penalties.
For a team that is about to win the Premier League, losing to Sporting is somewhat surprising. So they weren't in their day and didn't play well
The goal Sporting scored in the game was very good, one will not expect a strike from that distance to beat a goalkeeper as good as the Arsenal keeper. Sporting will feel very confident in the competition being the team that eliminated one of the teams that people expected can also be winners in the Europa competition, they can go very far. Another team to expect to still do well is Roma because of good and experienced their coach José Mourinho is and how well he likes to win titles. Roma will have a challenge in the quarter finals first, they will have to somehow win Feyenoord that scored many goals to qualify to this stage.For a team that is about to win the Premier League, losing to Sporting is somewhat surprising. So they weren't in their day and didn't play well