Two first-half goals have put Sevilla in a commanding position over Valencia in the first leg of their Europa League semi-final.

The opening period of the all-La Liga clash was played largely at a frenetic pace, and it was the home side who took the lead on 32 minutes when Stephane Mbia turned home Daniel Carrico's cross.

Los Che were incensed that the goal stood after replays showed the midfielder was in an offside position when he scored.

Three minutes later, Sevilla doubled their lead and it was Carlos Bacca who extended the advantage for Unai Emery's team.

The Colombian ventured on a strong run before hammering an effort into the bottom corner.