Very dependent. Chances are if he was performing well on his football team his Test was fine.
If his test is low, its likely because he used steroids as a teen. In which case a cycle of Test E will NOT grant him prime gains as he will lose it all even with PCT. If his Test is low, its testosterone replacement therapy (TRT) time. Simple as that. Well technically some people have had luck restarting their Test but its reeeeaaaallllly hit and miss after years of it being low.