VIENNA (Reuters) - Turkey defender Servet Cetin has been ruled out of their quarter-final clash against Croatia on Friday with a knee injury, leaving coach Fatih Terim with just 17 players to choose from.

"Servet will definitely not play tomorrow and if we qualify for the semi-final then it still looks difficult for him to play," Terim told a news conference on Thursday.

"We have 15 footballers, two goalkeepers and we can make three substitutions. That is what we have."

Turkey, who reached the last eight by coming back from 2-0 down to beat Czech Republic 3-2 in Group A on Sunday, have been without captain Emre Belozoglu because of a hamstring injury since their opening game.

Emre Gungor is out for the rest of the tournament with a calf problem while goalkeeper Volkan Demirel and Mehmet Aurelio are suspended. Midfielder Tumer Metin will also miss the Croatia match due to injury.

Terim said there would be no change in the team's philosophy despite their problems.

ATTACKING GAME

"We have so far started playing a slow game in the first half and then start attacking in the second," Terim said. "This is something that Croatia will experience as well because we will continue attacking so that we are the winning side at the end."

Terim said he had not discussed extra-time or penalties with his players as he hoped to finish the match in 90 minutes.

The Czech game would have gone to penalties if there had been a draw under new rules for final group games.

"I didn't tell my players about penalties before the last match and that holds true for the match tomorrow as well," Terim said. "I hope this match is finished after 90 minutes."

(Editing by Mark Meadows)