We've shipped 17 goals in 16 games, a ratio that we need to not worsen if we have any designs on being champions. One goal per game.
I think maybe one team has won the league in the last decade or so with having conceded at a worse ratio than that, with that being the faltering defence of Ferguson's last title-winning side (Vidic et al).
So conceding one per game isn't all that disastrous if the attack's going well enough. The two games we've played without SHKODRAN have been the two where we've conceded 2+ goals.