Two first half goals from star striker Islam Slimani put Sporting 2-0 up, before Brazilian hitman Leo Bonatini pulled back what proved to be a consolation for Estoril, as Jorge Jesus' Sporting picked up yet another win in their pursuit of the title.
Intriguingly though, there were a host of scouts at the game to observe players ahead of the summer transfer window, with two English clubs being represented at the 8000-capacity Estadio Antonio Coimbra da Mota.
Portuguese newspaper A Bola claim that talent spotters from Arsenal and Sheffield Wednesday were both at the game, though they were no doubt pursuing different targets.
The report suggests that Arsenal were there to see Sporting's superb defensive midfielder William Carvalho, with Arsene Wenger in desperate need of a player to sit and protect the back four - and the giant, physical Carvalho could fit the bill, even though he wouldn't come cheap.
Meanwhile, Wednesday boss Carlos Carvalhal is Portuguese himself, and has already swooped on Portuguese football for some of his signings at Hillsborough.
French defender Vincent Sasso signed on loan from Braga, whilst forwards Lucas Joao and Marco Matias both joined from Nacional last summer, with Carvalhal seemingly using his contacts in his homeland to secure new signings.
It's unclear who Wednesday were watching, but whilst Carvalhal is at the helm, Owls fans should expect to see their club continue to look towards Portugal for reinforcements, with Estoril players more likely to join than Sporting Lisbon players in this case.
Will Arsenal land Carvalho this summer? Should Wednesday continue to keep a close eye on Portuguese talent?