"....you missed the last Quidditch match, we were steamrollered by Ravenclaw without you...."
-- Ron Weasley to Harry (PS17)
Following his struggle with the Voldemort-possessed Professor Quirrell, a battered Harry Potter is unconscious in the Hospital Wing for three days. Because of this, he missed the last Quidditch match of the 1991-92 school year, against Ravenclaw. There was no alternative Seeker for the Gryffindor team with Harry out, so they were beaten by a large margin (PS17).
Lexicon list of Quidditch teams