Sabah suffered a 4-1 defeat to Norwegian side Viking in their fourth UEFA Champions League league-phase match in Stavanger.
The Azerbaijani champions went into half-time level at 1-1, but Viking took the lead in the 69th minute after scoring from the rebound of a penalty.
The match became more difficult for Sabah when Aiden McCarthy was sent off in the 77th minute, leaving the visitors with 10 players. Viking scored twice more to secure a 4-1 win.
The team will now turn its attention to the remaining league-phase fixtures, including a home match against Barcelona at Baku Olympic Stadium on 25 November.