We don't have confirmed lineups or formations from the brief, but we can paint a pretty clear picture. Celta, under their usual setup, will likely line up in a 4-3-3 or a 4-2-3-1, looking to dominate possession and use the width of Balaídos. They'll want to get their full-backs high, stretch Osasuna's block, and feed the wide men in one-v-one situations. Expect Iago Aspas — if he's still pulling the strings — to drop into the half-spaces and knit attacks together. That's where Celta do their best work: quick, intricate passing around the box, with runners from midfield arriving late.

Osasuna will almost certainly sit in a mid-to-low block, probably a 4-4-2 or 4-5-1, and look to hit on the break. They're not a side that will come to Vigo and play expansive football — that's not their DNA. They'll be compact, narrow, and happy to let Celta have the ball in non-dangerous areas. The battle will be won in the final third: can Celta break down a deep defence, and can Osasuna spring the counter without leaving themselves exposed? Set pieces could be a factor too — Osasuna are always a threat from dead balls, and Celta can be vulnerable to them. But if Celta get their passing game going, they should have too much quality in the final third.