Whilst preparing an answer for another question about the Gryffindor Quidditch team I realised that I didn't know who filled Harry's place in the final game of the season in Philosopher's Stone. I just put "unknown player". Has it ever been stated who that player was?
We know that the Gryffindor vs. Ravenclaw game went ahead without Harry, who was still recovering in the sick bay after his confrontation with Quirrell.
"Listen, you've got to be up for the end-of-year feast tomorrow. The points are all in and Slytherin won, of course - you missed the last Quidditch match, we were steamrollered by Ravenclaw without you - but the food'll be good."
(Philosopher's Stone, Chapter 17, The Man With Two Faces).
We know that Gryffindor didn't have a huge range of backup Seekers since Wood didn't appoint anyone at the trials that year. But presumably they played somebody.
Who was it?
I've just found the following quote, which implies that Harry believed that Gryffindor wouldn't be able to play at all without him since there was no replacement Seeker.
Speaking quietly so that no one else would hear, Harry told the other two about Snape's sudden, sinister desire to be a Quidditch referee.
"Don't play," said Hermione at once.
"Say you're ill," said Ron.
"Pretend to break your leg," Hermione suggested.
"Really break your leg," said Ron.
"I can't," said Harry. "There isn't a reserve Seeker. If I back out, Gryffindor can't play at all."
(Philosopher's Stone, Chapter 13, Nicolas Flamel).