But with just five domestic games remaining, Charteris, who continues to lead the side in the absence of captain Tom Willis, hasn't given up hope on Heineken Cup qualification.
"All our emphasis is on trying to get Heineken Cup rugby next year, there is nothing better and it's a massive goal, the guys deserve it," said the Welsh second-row.
"We're going to have to qualify for the play-offs to do it by the looks of it, it's going to be another massive challenge so it's a double reward. We've got to play the Ospreys and the Blues, but win those games and we will give ourselves a chance.
"It's a bit of a challenge but we haven't given up on that goal."