Who warns Odysseus for future dangers within his travels?

Odysseus is warned about future dangers during his travels by the prophet Tiresias, whom he encounters in the Underworld. Tiresias provides crucial guidance on navigating the challenges he will face, including the dangers posed by the Sirens and the temptation of the cattle of the Sun God, HeliOS. Additionally, the goddess Circe also offers him warnings and advice to help him avoid perilous situations on his journey home.