The show's judge revealed that he is expecting a close contest between child singers Faryl Smith and Andrew Johnston, dancer George Sampson, Michael Jackson tribute act Signature and dancing dog Gin.
"I think it is going to be unbelievably close between them and they are the five we like the best too," Cowell told The Mirror. "I think George has got as much of a shot as any singer and I wouldn't write off Signature yet. If the dog wins, what will I do? I'll get on the phone and call Pedigree Chum immediately!"
Cowell predicted that 12-year-old Faryl will have something special in store for her slot tonight. She has previously wowed the judges with performances of 'Ave Maria' and 'In The Arms Of Angels'.
"I still don't think we have seen the best of her," he said. "I have a feeling she is going to be spectacular in the final."