An experienced goalkeeper playing at the highest level of the game, Marcio Augusto Aguiar dos Santos is also known as Testao. For Testao, the journey has been one with plenty of ups and downs. After coming through the youth team at Sao Paulo, in 1999, Testao remained one of the third goalkeepers and failed to make any appearances for the first team. In 2004, Sao Paulo sent him out on loan, to Paulista Futebol Clube, for some extra on-field action.
He was part of the squad that were crowned Campeonato Paulista, in 2000 as well as the team that went on to win the Torneio Rio-Sao Paulo, in 2001. Despite being part of the teams, Testao rarely played any part in the wins, even at the Supercampeonato Paulista, in 2002. He was also part of the Brazilian Under-20 team that won the South American Youth Championships in 2001.
He returned to Sao Paulo, only to be sent out on loan once again, this time to Gremio. Testao spent 2004-05 at Gremio but the club refused to sign him on permanently and Sao Paulo decided to let him go as well. Having played with Gremio in Serie B, Testao began playing with Paysandu Sport Club in Serie B. He was part of the squad that was crowed Campeonato Paraense in 2006, and despite choosing to move on, stayed on in the division. Realising his need for playing time, and moved to Ituano the following season.
In 2008, Testao moved to Gremio Prudente where he helped the team win the Paulisto do Interior title in 2008. After establishing himself as the first choice keeper in the Gremio line-up, Testao was knocking down the door of the top league teams. In 2011, he finally made his move when Atletico Paranaense signed him up as their first choice keeper for the new season.