It is not possible to speculate about Sevilla's performance. They lost their first three La Liga matches, with a narrow 1–0 win in the fourth. They could not win against Lens in the Champions League match. Overall the performance of this team is still quite weak and erratic. But the fact is that the Osasuna team is not in a good position either. Their achievement is only 6 points in 5 matches. However, considering the performance of the match between these two teams, Osasuna must be ahead. Osasuna have won their last three matches against Sevilla. But I think today's match is most likely to be a draw. Maybe the match will be ended in a 1-1 draw.
It is very possible because these two teams now have almost the same strength, but if you look at the squad that Sevilla has, I think they cannot be underestimated and it is possible that in this match they will rise from their downturn.
However, the odds issued by the bookie are quite logical and also this match is being played at Osasuna's home ground so it is only natural that they are slightly ahead.
There is no way to underestimate the Sevilla team. They have an excellent squad. The squad players are also very experienced. And more importantly, Sevilla are the Europa League champions for the last season. But their performance in La Liga this season is very poor. Even they were at the last position of the table. They scored 6 goals in 4 matches and conceded 8 goals. For these reasons, I cannot consider the Sevilla team as a favorite in this match. However, considering the squad and experience, Sevilla team should be called favorites in this match.