Ten-man Braga lost 3-2 at Nacional after conceding two goals in a three-minute span and Ismaily netting a decisive own goal in the Portuguese league on Saturday.
Braga remained in third place, six points behind FC Porto and nine points behind league leader Benfica. On Sunday, Benfica hosts Porto in a critical game for the title chase.
Helder Barbosa gave Braga the lead in the 37th minute by punching in a rebound.
But the hosts rallied to take the lead behind Edson "Mexer'' Sitoe's goal in the 58th and Diego Barcelos' header two minutes later.
Ismaily then headed the ball into his own net in a failed attempt to clear a free kick in the 77th.
Ederzito "Eder'' Macedo gave Braga hope with a goal in the 83rd. One minute later Braga was left with 10 men when Hugo Viana received a second booking.
It was Nacional's second win through seven home games this season.
Also, Maritimo drew 1-1 at Guimaraes.