Monaco manager Leonardo Jardim admits that a number of errors let them down in their 4-3 aggregate defeat by Valencia in their Champions League qualifier.
Les Rouges et Blanc gave themselves a mountain to climb following a 3-1 defeat at the Mestalla in the first-leg last week, and compounded matters by conceding an early goal at Stade Louis II on Tuesday.
Jardim's men did manage to turn the match around through goals from Andrea Raggi and Elderson Echiejile, but ultimately fell on aggregate in the tie and the Portuguese believes Alvaro Negredo's fourth-minute strike was the most costly error.
"Valencia's goal in the fourth minute changed my team's dynamic," he is quoted as saying by Ligue 1's official website.
"Our errors cost us dearly. We threw everything at them in the final minutes, through (Thomas) Lemar and (Guido) Carillo.
"Unfortunately it didn't pan out. I'm happy with the attitude my lads showed because they gave everything they had, even if it turned out to be not quite enough."