Valencia survived a scare to book their spot in the Champions League group stage at the expense of Monaco in the battle between two former finalists.
The Primera Division side were leading 3-1 from the play-off first leg and looked to be cruising through when Alvaro Negredo took advantage of a defensive mistake to put Los Che, runners-up in 2000 and 2001, ahead after just four minutes with a sublime chip.
However, Monaco, who lost to Porto in the 2004 final, fought back and goals from Andrea Raggi (17) and Elderson (75) set up a grandstand finish at the Stade Louis II.
The home side could not find an equaliser, though, to leave Valencia 4-3 winners on aggregate and see Spain become the first country to have five teams in the group stages in a single season - the others being Barcelona, Real Madrid, Atletico Madrid and Europa League champions Sevilla.