For the next match against Bilbao, I think if Lewandoski and Frankie De Jong are absent it is still possible for Barcelona to win, because there is a difference in the quality of the teams between the two, even though Bilbao is in good form at the start of this season, overall they are still has the quality under Barcelona.
Even though currently Barcelona cannot be strengthened by Lewandowski and Frankie De Jong, there are still alternatives that can be used as options. Xavi can rotate his loan players such as Joao Felix, and then he can still utilize his wonder kids, namely Yamal and Ferran in the midfield line, there is also Gundogan who can provide breakthroughs. Although I admit that playing against Atletico Bilbao can be a bit troublesome because, with the limited number of players required to play 90 minutes, it is a tough thing and a risk.
So the Real Madrid squad is now complete and Ancelotti no longer needs to rotate his players to cover the gaps left by his players due to injuries. In the match against Sevilla, it is clear that 3 points will belong to Real Madrid and we all know that it is not a complicated matter.
I personally feel that Madrid will still not underestimate Sevilla in this match. Even though Sevilla's condition is quite bad, that doesn't mean Ancelotti will be careless in implementing the formation. 3 points can be achieved, but Sevilla will play at home which is a plus point and try to improve its poor performance.