 Complete the following phrase:  Kirkland made his debut for Liverpool in October 2001, but mostly served as understudy to first-choice goalkeeper Jerzy Dudek during the 200102 season. During the following season, costly errors by Dudek in a league fixture against Manchester United resulted in manager Gérard Houllier handing the first team place to Kirkland in December. He played 14 consecutive matches, during which he kept six clean sheets, but sustained an ankle injury in January 2003, which ruled him out for the rest of the 200203 season, meaning he missed the victorious 