Lions were losing 1-0, but managed to come back to 2-1 and added three points.
Sporting won this Thursday at the home of Austrian side Sturm Graz, 2-1, thanks to a turnaround in the game on the first day of Group D of the Europa League.
Boving put the Austrians ahead in the 58th minute, but Gyökeres (76) and Diomande (84) gave the Lions their first victory in Austria.
With the first three points, Sporting shares the leadership of Group D with the Italians Atalanta, who beat the Polish Raków Czestochowa 2-0 at home.