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Chemlal testified for the first time on Tuesday alongside Driss Oukabir, Mohammed Allaa, and Sahal El Karib.
All four were charged with terror-related murder over the attacks in Barcelona and Cambrils which killed 15 and wounded more than 120.
An extremist imam with links to al-Qaieda was the mastermind behind the Barcelona attack and planned to blow himself up in a much larger atrocity, a court has heard.
Two of the four men arrested in connection with the plot told Spain's National Court that Abdelbaki Es Satty, who preached at a mosque in the town of Ripoll where most of the attackers were from, was the instigator of the terror plot.
After spending Saturday and Sunday in France, the group then drove back to Spain in the same car.
At Tuesday's closed-door hearing at the Audiencia Nacional, Judge Fernando Andreu will read out charges against the men expected to include counts of terrorism, murder and weapons possession.