[6] In September 2011, Gardoș received a ten-match ban after seriously tackling Pandurii Târgu Jiu midfielder Cosmin Băcilă, which resulted in a broken left tibia and fibula.

[7] On 14 August 2014, Gardoș signed a four-year deal with English club Southampton for an undisclosed fee, believed to be around €7.5 million.

[8][9] On 13 September, he made his first appearance for "the Saints" as an 89th-minute substitute for Jack Cork in a 4–0 Premier League victory over Newcastle United.

[10] On 23 July 2015, Southampton manager Ronald Koeman announced that Gardoș would be sidelined for up to seven months after suffering a knee injury in a pre-season friendly with Feyenoord.

[12] On 19 February 2018, the last day of the winter transfer window in Romania, Gardoș joined Universitatea Craiova on loan for the remainder of the campaign.