There was nothing complicated about Lenglet's opener, the Frenchman rising high above two defenders and heading into the corner for his first league goal in a Barcelona shirt.
But Barca hit back nearly immediately when Lionel Messi picked out Alba, who did his best impression of the Argentine by cutting in from the left wing and producing a magnificent curling finish into the top corner.
Earlier in the day Tomas Lemar netted an 85th minute goal to give Atletico Madrid a narrow 1-0 win away to Eibar to maintain their distance nine points behind Barcelona, while Iago Aspas scored the first goal of the game as Celta Vigo took a big step towards assuring survival with a 2-1 win at home to Girona.
I understand people when they say that we are already champions and that we just have to wait for the date, but the points have yet to be achieved.
For 10th-place Sociedad who lost to Barcelona on Saturday, it's now 28 years since they last won a match at Camp Nou, though they can take some comfort from forcing Barcelona to work for the points. They could clinch the title as soon as Wednesday if they win against Alaves and Atletico lose to Valencia.
"I think the manager is dividing the minutes out really well among the different players, but we got the result which is the important thing", he said. "It's the final phase of the season and everything is definitive, but the opposition oblige us to be at our best all the time".
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Arturo Vidal went close three minutes later but could not keep the ball down when it was flicked on to him at the far post after a Messi free-kick.
"I don't know how to evaluate it", added Valverde.
"We go with the intention of winning, because there is no other way to face a game like this", said head coach Immanol Alguacil. "It's anecdotal more than anything but everything that happens at our club is given too much importance".
Information from Reuters and ESPN FC's Sam Marsden was used in this report.