Sean McMahon named to make Wallabies Test debut against Wales at Millenium Stadium Sean McMahon has been named in the Wallabies Test side to face Wales. MELBOURNE Rebels tyro Sean McMahon has capped an astounding debut season by winning Wallabies Test selection against Wales. Plucked from obscurity by Melbourne coach Tony McGahan and given an extended playing squad contract, McMahon has been named to start in the backrow against the Welsh at Millennium Stadium in Cardiff on Sunday morning (AEDT). His elevation to full international colours comes after an unparalleled breakout season. The 20-year-old is now one of the hottest commodities in rugby, having switched from the Australian sevens team to chase Super Rugby representation with the Rebels. His decision has landed a raft of honours including Super Rugby rookie of the year, Australian under-20 captaincy and player of the year and National Rugby Championship player of the year. The Brisbane native won selection in 13 games for Melbourne and, ironically, replaces Melbourne captain Scott Higginbotham at No 6 against Wales. Higginbotham has a strained hamstring. Sean McMahon will make his Test debut for Wallabies against Wales this weekend. Wallabies coach Michael Cheika said McMahon had sealed Test selection with a powerful display against the Barbarians. McMahon is one of two uncapped players chosen in the team, with Western Force prop Tetera Faulkner earning a spot on an extended nine-man bench. Cheika has again chosen an extended bench which includes hooker James Hanson, props Faulkner and Ben Alexander, locks James Horwill and Will Skelton, backrower Matt Hodgson, scrumhalf Will Genia, flyhalf Quade Cooper; and winger Rob Horne. One player will be omitted from the bench in the lead-up to gameday. Cheika said the team was looking forward to their first Test match of the Spring Tour. "I've been really pleased with the attitude and commitment of the team and by how they have embraced a new environment and way of doing things," he said. Everyone has worked really hard on preparing themselves in the best possible way, and we're all excited about the opportunity to represent Australia and give our absolute best on Saturday. The match is Australia's second of their five-game Spring Tour, and will be followed by Tests against France, Ireland and England.