We don't have confirmed lineups or formations from the brief, but we know the tendencies. Celta under their current setup will likely line up in a 4-3-3 or a 4-2-3-1, looking to dominate possession and use the wide areas. Iago Aspas, if he's still pulling the strings, will drift into those half-spaces and knife through the lines. Osasuna, true to their DNA, will probably sit in a mid-to-low block, compact in a 4-4-2 or 4-5-1, and look to hit on the break or from set-pieces. They're second-ball merchants, physical in both boxes, and they'll make it ugly if they can.

The midfield dogfight will decide this. Celta's double pivot needs to control the tempo and avoid getting bullied. Osasuna will try to disrupt, to turn it into a scrap, to make Balaídos nervous. But if Celta can move the ball quickly, stretch the pitch, and get their full-backs high, they'll create chances. Osasuna's 0-2 loss to Al Ain suggests their defensive shape isn't fully set yet — gaps were there, and a sharper attack will punish them. Expect Celta to have the lion's share of the ball, and the question is whether they can break down that low block before frustration creeps in.