FRANKFURT, April 18 — Embattled Tottenham coach Ange Postecoglou said yesterday’s 1-0 win at Eintracht Frankfurt, which sent them to the Europa League final four, showed his side still believed in his system.

Spurs’ poorest league season in decades had the coach under fire, with reports suggesting he could be sacked depending on Thursday’s result.

But as Postecoglou’s side have done rarely in any competition this season, Spurs dug deep and controlled the game after going 1-0 up shortly before half-time through a Dominic Solanke penalty.