Porto coach Jose Mourinho says he has scouted Scottish champions Celtic exhaustively in preparation for next week's UEFA Cup final between the two clubs in Seville.
"It's impossible to study our opponents any more unless we go without sleep," said Mourinho. "We have been present at all Celtic's recent games.
"We also have videos of their [UEFA Cup] games against Boavista, Stuttgart and Liverpool. Everything has been seen again and again, gone over in detail".
Mourinho also expressed optimism that key midfielder Francisco Costinha would recover from a pulled muscle in time to play a part in the May 21st final.
Costinha had special training on Thursday after spending Wednesday in therapy as he tried to shake off the injury, which he sustained in a 1-0 league defeat at Pacos Ferreira on Sunday.
Defender Nuno Valente and Lithuanian striker Edgaras Jankauskas, who is likely to replace suspended Helder Postiga in the final, also underwent special training on Thursday.
Mourinho said he was likely to play Jankauskas in the league match at home to Varzim on Saturday but would rest some other players as a precaution as Porto have already clinched the title.