After losing in the first round of the singles competition at the ATP 250 Gstaad, in Switzerland, Joo Sousa decided not to continue playing in the tournament.
The 33-year-old was supposed to compete with Benoit Paire, but the Frenchman withdrew hours before the match after falling behind 6-2, 2-0 to Elias Ymer of Sweden in the singles competition.
This week, Sousa will travel to Kitzbuhel, Austria, where he has already qualified for the singles finals.
Francisco Cabral, a Portuguese doubles player, will compete with Tomislav Brkic of Bosnia on Wednesday in the first round of the Gstaad tournament.