Sunderland slipped to a 1-0 defeat to Nacional in their pre-season friendly on Wednesday evening.
The visitors could only muster a couple of half-chances in the first period with Steven Fletcher's dangerous cross evading all, moments after Adam Johnson had an effort blocked.
Wes Brown headed just over the cross bar from a corner kick moments before the break.
Connor Wickham came close for the Black Cats but his effort was hacked clear off the line before the hour mark, minutes before Lee Cattermole was forced off through injury.
With the game heading for a goalless draw, Lucas popped up for Nacional to turn the ball home and condemn the Premier League side to defeat.
