The fixture will culiminate Forest's pre-season training camp in the Portuguese sunshine, with boss Billy Davies declaring himself pleased with the condition his players have reported back in for the upcoming campaign.
"It is useful getting the players out here and spending some time together," he told the official club website.
S.C. Olhanense play in the top division of the Potuguese league at their 10,000 capacity Estadio Jose Arcanjo where Saturday's game will take place.