Boca Juniors fans filled La Bombonera to max capacity for a training session ahead of their Superclasico cup-final clash with River Plate.

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The 49,000 capacity stadium was filled to the brim with the City Government having to close the stadium to more than 10,000 fans outside the stadium.

Club president, Daniel Angelici told Argentine Sports channel TySports: "There were a lot of fans out there, we have exceeded ourselves and they have closed the stadium.

"It was because of the excess of people on the stairs, which are emergency exits, and on the access to the North and South stands. 

"There were more people than were allowed."

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During the session, a fan ran onto the field before being tackled by security. Former Manchester United striker Carlos Tevez convinced the security to release the fan before handing him his training shirt. 

The fan responded by gifting Tevez his hat.

​The final leg of the Copa Libertadores final is set to be played Sunday morning 7 am (AEST), at River Plate's home ground of El Monumental.

The first leg finished 2-2, and while no Boca fans will be allowed at the second leg the players were able to feel the support from those who attended the training session.