UEFA is continuing to investigate fewer than 20 European clubs suspected of failing financial fair play rules.
Sevilla have been drawn against Valencia in the semi-finals of the Europa League, while Benfica will tackle Juventus.
Paco Alcacer scored a hat-trick as Valencia overturned a 3-0 first-leg deficit to thrash nine-man Basel 5-0 after extra-time to reach the Europa League semi-finals.
Juventus booked their place in the semi-finals of the Europa League with a 2-1 home win over Lyon in Turin on Thursday evening.
Benfica eased into the Europa League semi-finals after Rodrigo Moreno's double secured a 2-0 home win over AZ Alkmaar.
Sevilla fought back from a first-leg deficit to claim a 4-2 aggregate win over Porto in the Europa League quarter-final on Thursday evening.
Leonardo Bonucci struck in the 85th minute as Juventus claimed a 1-0 advantage over Lyon in Thursday's first leg of their Europa League quarter-final tie in France.
Eliaquim Mangala's first-half goal proved decisive as Porto beat Sevilla 1-0 in their Europa League quarter-final first leg at the Estadio do Dragao on Thursday night.
Benfica are firmly in the hunt for another Europa League final appearance following a 1-0 victory away to AZ Alkmaar.
Matias Delgado scored a first-half brace as Basel convincingly beat Valencia 3-0 at home in the Europa League in a match which was played behind closed doors.
Benfica will be hoping their excellent record against Dutch sides continues when they face AZ Alkmaar on Thursday night.
UEFA has opened disciplinary proceedings against Basel after crowd trouble in their Europa League last 16 clash against Salzburg in Austria on Thursday night.
Tournament favourites Juventus have been drawn to play Lyon in the quarter-finals of the Europa League next month.
Match-winner Andrea Pirlo says Juventus never stopped believing they could reach the quarter-finals of the Europa League at the expense of Fiorentina.
Rafael Benitez was frustrated Napoli were unable to win a "one-way match" against Porto as the Italians bowed out of the Europa League on Thursday.
Sevilla made history as they recovered from a 2-0 first-leg deficit to knock arch-rivals Real Betis out of the Europa League last 16 following a penalty shoot-out.
Basel overcame the early sending-off of Marek Suchy to beat Red Bull Salzburg 2-1 and progress to the quarter-finals of the Europa League on a dramatic night at the Red Bull Arena.
Porto struck twice in the space of seven second-half minutes to knock Napoli out of the Europa League 3-2 on aggregate after a 2-2 draw.
Tim Sherwood believes the manner of Tottenham's Europa League display at Benfica shows the players are right behind him.
Juventus reached the Europa League quarter-finals after Andrea Pirlo's free-kick secured a 2-1 aggregate win over Serie A rivals Fiorentina.