Kai Havertz scored a second-half stoppage time winner to give Arsenal the advantage in their Champions League quarter-final tie against Sporting CP.
Arsenal looked to be taking a goalless draw back to the Emirates Stadium for the second leg.
But Havertz struck in the 91st minute, slotting in from Gabriel Martinelli’s through ball to put his side ahead in the tie.
The two sides will meet again for the second leg in London on Wednesday April 15.