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No vini, no problem. Vini can be replaced by Rodrygo, who can also play as a left winger. Rodrygo is one of Real Madrid's most important players because he can play in a variety of positions. I expect Ancellotti to use this line-up.
LW = Rodrygo, RW = Brahim Diaz, AM = Bellingham, and ST = Joselu.
This can still be rotated, depending on Bilbao's strategy soon. I consider Bilbao to be a strong team, and Ancellotti will not pass up the opportunity to earn three points and bring the club closer to the LA Liga.
Real Madrid has a limited number of wingers, which may encourage Ancellotti to rotate his players. I've seen Brahim Diaz play as a right wing several times. Expect Real Madrid to use this formation against Bilbao shortly.
It's caused by brahim diaz is the only capable player who can play as right winger as good as rodrygo which will be play at vini's position.
Ancelotti will certainly find the right formula for his squad if one of his main players is injured. For example, Vinicius; Ancelotti can play several players in that position, including Brahim Diaz and Rodrygo, but without Vinicius, Real Madrid's performance will be different. I'm sure about that because so far Vinicius has been a good attacking motor in the Real Madrid squad, so of course it will be different without him.
It is certainly not easy for Bilbao to hope for victory at the Santiago Bernabéu, but as long as they really work hard and take advantage of their opportunities then victory is not impossible. Real Madrid is clearly the favorite over Athletic Bilbao at home, but because Bilbao wants to stay in the Champions League zone, this match will probably be very tense. Bilbao will try to do their best to win, if they lose they must be willing to let Atletico Madrid gain their position in the Champions League zone.
It will be a do or die match for both clubs, because something important is at stake if any of them loses this match. If Real Madrid loses this match, it means that they will make Barcelona to close the point gap to 5 points, since Barcelona is not playing with a team as strong as them. This is what Ancelotti will consider.
Also if Bilbao does not win this match, it means that Atletico Madrid would take over the 4th position from them, if the win their own match. This will make Atletico not to be able to be in the champions league next season if Atletico did not drop points for them to take over the fourth position back. I still believe that Real Madrid is the favorite in this game because they gat good and strong players that will not accept defeat.