The Reds center back says he has had a positive return on his MLS experience and likened the fan support in Toronto to that of a European club.
O'Dea is hoping to earn a place in Trappatoni's starting XI after a positive first season at his new club, and he countered detractors against the league he joined from Celtic last summer.
"After going out on loan a lot, playing games did me good," O'Dea told reporters. "The MLS is maybe not looked at in a high regard, but personally I'm happy with the experience I had.
"Until you go out there and actually see the league it's hard to understand. It's completely false what people believe. At Toronto I play in front of larger crowds than I did in the Championship, and the Toronto fans are like European [fans] in the way they support the team, it depends where you are. We're really well supported."
O'Dea wants to end the season on a positive note and is eagerly awaiting the challenge of fixtures against England, Georgia, Spain and the Faroe Islands.
"It's important we sign off on a good note this season and pick up a good result [against England]. Obviously the next three games are hard fixtures against good opposition, but we need to test ourselves against top sides and do better."