UEFA also fined FC Basel 107,000 euros ($147,500) after objects, including cigarette lighters, were thrown on to the pitch in their last-16 clash against Salzburg last week with the referee halting the game for ten minutes.
A second one-match stadium ban was suspended for two years, UEFA said.
Basel and Valencia meet on April 3rd.
Meanwhile, Basel fans were celebrating their team's 1-0 victory against FC Lucerne on Wednesday night in the Swiss Cup semifinal.
The win sets up a cup final between Basel and FC Zurich for the first time since 1973.