2019–20 EuroCup

Arka Gdynia, also known as AMW Arka Gdynia for sponsorship reasons, is a Polish professional basketball team, based in Gdynia. The team plays in the Polish PLK. The club's sponsorship name comes from Akademią Marynarki Wojennej. Historically the team is one of the most successful in Poland, mainly because of the nine championships in a row the team won from 2004 to 2012.

Baskets Oldenburg, for sponsorship reasons EWE Baskets Oldenburg, is a professional basketball club that is based in the city of Oldenburg, Germany. The club plays in the Bundesliga. The club's name is derived from the team's main sponsor EWE AG, which is an electric utility company. The club's home arena is the Große EWE Arena.

Tofaş Spor Kulübü (Turkish: Tofaş Sports Club), or simply Tofaş S.K., is a professional basketball team that is based in Bursa, Turkey. Their home arena is the Tofaş Nilüfer Spor Salonu, with a capacity of 7,500 seats. The team is sponsored by Turkish car manufacturer Tofaş.

Darüşşafaka Basketbol (Darüşşafaka Basketball), commonly also known as Daçka Basketbol or simply Daçka, also known as Darüşşafaka Lassa for sponsorship reasons, is a professional basketball club that is based in Istanbul, Turkey. Darüşşafaka's basketball section, which was founded in 1914, is a part of Darüşşafaka Spor Kulübü (Darüşşafaka Sports Club) multi-sport club, which was founded in 1914. The club's basketball department is their most successful section. The club plays in the Turkish Basketball Super League. Its home arena for national domestic Turkish Super League games is the Darüşşafaka Ayhan Şahenk Sports Hall, with a seating capacity of 3,500, while its home arena for European-wide games is the Volkswagen Arena Istanbul, with a seating capacity of 5,240.

In the 2019–20 season, Partizan NIS Belgrade will compete in the Serbian League, Radivoj Korać Cup, Adriatic League and EuroCup.

The 2019–20 EuroCup Basketball season, also known as 7DAYS EuroCup for sponsorship reasons, was the 18th season of Euroleague Basketball's secondary level professional club basketball tournament. It was the 12th season since it was renamed from the ULEB Cup to the EuroCup, and the fourth season under the title sponsorship name of 7DAYS.

Galatasaray S.K. is a professional basketball team based in the city of Istanbul in Turkey. It is a part of the Galatasaray Sports Club. The team competes in the Turkish Basketball Super League and Basketball Champions League. The team has won 16 Turkish championships (5 titles in the Turkish Super League and 11 in the former Turkish Basketball Championship). The team furthermore won 3 Turkish Cups, 2 Turkish Super Cups, and 1 EuroCup.

Promitheas Patras B.C. (Greek: Προμηθέας Πατρών K.A.E.) is a Greek professional basketball club that is based in Patras, Greece. The club currently competes in the Greek Basket League and the Basketball Champions League. Promitheas also previously competed in the EuroCup for four seasons, reaching the quarter-finals twice. It is one of Patras' prominent basketball clubs, along with Apollon.

Aquila Basket Trento, also known for sponsorship reasons as Dolomiti Energia Trento, is an Italian professional basketball club based in Trent, Trentino.

The Pallacanestro Brescia, better known for sponsorship reasons as Germani Brescia, is an Italian professional basketball team, based in Brescia, Lombardy. Founded in 2009, the team plays in the Lega Basket Serie A (LBA) since the 2016–17 season.