Cameron Donald says competing in the World Endurance Championships has given him "invaluable time in the saddle" in preparation for this year's TT races.
The Australian racer has been competing as part of the TT Legends team in the World Endurance Championship alongside 17-time winner John McGuinness.
Donald said: "Time in the saddle is invaluable for coming here, the TT is a real endurance test itself."
A six-lap race around the island's Mountain course is 226.38 miles.
The Melbourne racer made his debut in 2005 and completed a TT double in 2008, winning both the opening Superbike race and the Superstock race.
Donald recently helped the TT Legends team to sixth at the 24-hour Bol d'Or race in France.
"This year I am riding the endurance races to help me at the TT. At the Bol d'Or I rode more than 250 laps in all kinds of conditions. It's great training," he said.
During the race Donald suffered a high-speed crash but in line with Endurance World Championship rules the uninjured Australian was able to push his bike back to the pits.
This year he will again be racing for Wilson Craig at this year's event.
"Last year we had the pace and led races. Unfortunately we couldn't quite put the pieces together to pull off any wins," added Donald.
"We had the speed so hopefully this year we can pull the package together and get Wilson a win."