The Basques shot into a 2-0 lead at La Riazor inside five minutes thanks to goals from Juanmi and Asier Illarramendi.

Deportivo fought back, though, as Adrian Lopez pulled a goal back before half-time before on loan Arsenal forward Lucas Perez was summoned from the bench on his return to Galicia.

Perez had only been on the pitch a minute when Florin Andone levelled for the hosts.

However, Sociedad maintained their 100 percent record through three La Liga games as Diego Llorente and Illarramendi struck again in the final 10 minutes.

Sociedad host an under-strength Real Madrid next weekend with the European champions already four points adrift of Barcelona at the top of the table.

Madrid will be without Cristiano Ronaldo as he completes a five-game domestic suspension for pushing a referee.

Marcelo will also be banned after he was sent-off in Saturday's 1-1 draw at home to Levante, whilst Karim Benzema is expected to be sidelined for a month with a hamstring injury.