Klos became first choice in 1991–92, relegating Wolfgang de Beer to the bench.[3] He totalled 31 games for the campaign as his team finished runners-up, going on to win back-to-back national championships during his spell.[4][5]
As well as playing every match in 1996–97 for the third-placed side, Klos added 11 in that season's UEFA Champions League as they won the tournament for the first time.[6] He left the club with 339 competitive appearances, and 114 clean sheets.[7]
Klos was appointed team captain in July 2004.[22] Six months later, he picked up a knee ligament injury in training,[23] missing the remainder of the season and being replaced by Ronald Waterreus;[24] the Dutchman retained his place after he regained full fitness.[25]
Klos looked set to challenge new signing Lionel Letizi after Paul Le Guen's arrival at the start of 2006–07, but he suffered a biking injury which gave long-term third choice Allan McGregor the chance to play.[26] On 22 February 2007, he made his first appearance of the season for the first team against Hapoel Tel Aviv FC in the round of 32 of the UEFA Cup, after McGregor was sent off in a 4–0 home win.[27][28]
Klos left Ibrox Stadium at the end of the campaign after eight and a half years, having played 298 matches in all competitions.[29][30] He retired at the age of 36,[29] and subsequently settled in Switzerland.[31]
In 2009, Klos was inducted into the club's Hall of Fame.[30]
^Jürgens, Tim; Hitzlsperger, Thomas (30 April 2020). ""Genießen konnte ich Spiele nie"" ["I never enjoyed playing"] (in German). 11 Freunde. Retrieved 28 January 2021.
^"Der "Held von Auxerre" prüft die Kasse" [The "Hero of Auxerre" checks the cash register] (in German). Borussia Dortmund. 4 December 2013. Retrieved 24 October 2019.