Hidalgo will set up his Deportivo in a 4-4-2, and it will be compact. Two banks of four, Aubameyang and a partner up top, looking to spring the counter through the channels. The Riazor crowd will demand energy, and Hidalgo's men will give it. The danger is that a 4-4-2 against Pellegrini's 4-2-3-1 can get overrun in midfield if the front two do not screen the double pivot. Betis will look to dominate the ball, with Isco pulling the strings in the ten role. If Isco finds pockets between Deportivo's midfield and defence, it could be a long evening for the hosts.

But here is the tactical wrinkle. Deportivo's two-striker arrangement means Betis's centre-backs always have a body on them. Aubameyang's movement in behind is still sharp, and if Betis push their full-backs high, the home side will target that space. Betis will have joy in possession, but they must be wary of the transition. Pellegrini's side are not a low-block team — they defend by keeping the ball. If Deportivo can turn it over in midfield, the Riazor will roar them forward. Set-pieces could also be a factor. Deportivo have scored from dead balls already this season, and Betis have shown vulnerability in the air without Llorente, who is absent with discomfort. That is a real edge for the hosts.