Conversation so far:
How long did it take Drazen Petrovic to win the Yugoslav league?
The very first year in Cibona Drazen Petrovic won both the Yugoslav League championship and the Yugoslav National Cup.
Who did Drazen Petrovic beat to win the Yugoslav league?
The 87–78 victory was over the Spanish League club Real Madrid.
How many points did Drazon Petrovic make to win the Yugoslav league?
Drazen Petrović contributed 36 points, brought him and Cibona their first European Cup title.
What was Drazen Petrovic's next game after winning the Yugoslav League?
The second came the following year, as Drazen Petrović scored 22 points and Cibona defeated the USSR Premier League club Žalgiris Kaunas, which starred the legendary Arvydas Sabonis.

Question: When did he win his next cup
Self-contained rewrite: After defeating the USSR Premier League Club Zalgris, when did Drazen Petrovic win his next cup?