In January 2008, Wirth played the friendly tournament City of Osorno, playing very well in the 2–2 draw with Unión Española, saving three shots in the penalties. Despite of that, Wirth not started in the first week of the Apertura Tournament against Provincial Osorno. In the fifth week of the tournament against Rangers, Wirth was started in a 2–2 draw, in where he conceded a goal to the forward Lucas Palma in the last minute of game. After the surprise resignation of Claudio Borghi as coach, who led Colo-Colo to important victories, Wirth was starter in the first game of Fernando Astengo as coach, in a 2–1 win over Deportes Antofagasta, in which he also saved a penalty, but in the repetition of that for overtaking of Wirth, he failed to save the penalty and conceded a goal in the victory. He again started in the two last weeks of the regular phase against Cobreloa and Cobresal. After the penta-championship loss against Everton, the coach Astengo was fired and arrived the former footballer of the club, Marcelo Barticciotto, who only used to Wirth in a Copa Chile game against Fernández Vial, that Colo-Colo won 4–2. After his lack of games in the season, it was reported that Wirth would no longer be part of the plans of Barticciotto.