Abel Resino's side have had a poor start to the season and struggled to create openings in the first half, while Constantinos Charalambides squandered two glorious chances for the visitors.
Sergio Asenjo produced a superb save to deny the APOEL striker in the eighth minute and the same player sidefooted wide when he had the goal at his mercy just before halftime.
"We played very well in the second half but their goalkeeper was very good and we were short on luck," he told a news conference.
"This result was not part of our plans so we have to go to Porto now and get three points," he added.
APOEL coach Ivan Jovanovic bemoaned his players' wayward finishing but praised Chiotis.
"He made some extraordinary saves from Forlan, one of the best forwards in Europe, and that means his effort is all the more valuable."
