French authorities have detained a man linked to an Algerian driver who allegedly sped his car into a group of soldiers near Paris.

The man was arrested on Wednesday and will be questioned by counter-terrorism investigators, a judicial official said.

Police have been unable to question the chief suspect, Hamou Benlatreche, because he remains in hospital with serious injuries sustained during his arrest, according to the official.

A soldier patrolling near the scene of the attack (Kamil Zihnioglu/AP)A soldier patrolling near the scene of the attack (Kamil Zihnioglu/AP)

Police have not disclosed a motive for the August 9 attack that injured six soldiers in the Paris suburb of Levallois-Perret.

Benlatreche, 37, was known to authorities as a suspect in minor crimes but not as someone with radical beliefs, police said.