Ospreys captain Alun Wyn Jones is refusing to give up on his side's chances of progressing in the European Champions Cup.
The Welsh region fought back from 15-0 down away to Racing Metro before eventually losing 18-14 on Saturday.
It means Ospreys are now third in Pool 5 with two games to go, seven points behind leaders Northampton.
"It's not undoable," said Jones, "But we've got to focus on our next four games and then look at it."
The Swansea-based region's European hopes are hanging by a thread, and Jones admits to feeling frustrated that they failed to complete a comeback which had looked unlikely at half-time.
French side Racing raced into a 15-0 lead thanks to two tries in three minutes by wingers Juan Imhoff and Teddy Thomas.
But after the break, Racing played the first 20 minutes of the half with 14 men as number eight Antonie Classen and then scrum-half Maxime Machenaud were sent to the sin bin.
Ospreys kicked to the corner instead of taking shots at goal when awarded kickable penalties as they took the game to their hosts.
Rhys Webb and Eli Walker tries, converted by Dan Biggar, made it 15-14 with ten minutes to go, before Racing closed out the match, sealing the win through a late Johannes Goosen penalty.
"I think we were probably a bit naive with a few of the line breaks we had, because we did have opportunities in the first half, but we didn't take them," said Jones.
"After half time we tried to increase the tempo and that paid dividends for us.
"To come here and perform like that I do feel we deserved more."
The Ospreys host Northampton Saints, who beat Treviso 67-0, next in the competition on the weekend of 16 January.
Before then they have four Pro12 matches starting with Ulster at home on Saturday, 20 December.