Shares in Juventus plunged as much as a quarter in value this morning after the Italian soccer club was knocked out of Europe's Champions League competition by Ajax Amsterdam. 

The Turin-based club lost 1-2 at home against Dutch club Ajax last night in the second leg of the quarter finals, resulting in a 2-3 aggregate defeat. 

Juventus signed Portuguese star Cristiano Ronaldo for a transfer fee of €100m in the hope he would help the club win Europe's elite soccer competition, as he did with Real Madrid for the last three seasons. 

Juventus has won the Italian league title seven times in a row, but has never managed to win the "treble" of the domestic league, Italy's cup competition and the Champions League. 

Inter Milan is the only Italian club to have achieved such a feat, under coach José Mourinho in the 2009-2010 season. 

Juventus, which has already been knocked out of the domestic cup competition this season, missed the chance to clinch an eighth consecutive Serie A title on Saturday after a surprise 2-1 defeat at SPAL.