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Rayo was utterly dominant throughout, limiting Strasbourg to no shots on target, though it survived a penalty check late in the game to ensure it will take a lead to France.

The first half was a cagey affair with few clear-cut chances, with Ben Chilwell sending Strasbourg's best chance over the crossbar with a long-range sighter.

Alemao's header skewed wide from close range, before Emmanuel Emegha's effort from inside the box sailed over the crossbar on the stroke of half-time.

Rayo stepped up titseir pressure after the break, with Isi Palazon's long-range drive spilt by Mike Penders before he turned provider, teeing up Alemao's looping header from a left-sided corner 54 minutes in.

Penders made a stunning save to keep out Florian Lejeune's header shortly after, while Ilias Akhomach, Unai Lopez and Pathe Ciss all tried their luck without finding an opening.

Rayo did survive a late penalty check when Andrew Omobamidele appeared to be caught by a high boot in the box, but nothing was given following a VAR review, and Rayo have the advantage to take away from Estadio de Vallecas.