Logician will put his unbeaten record and St Leger credentials on the line against just four rivals in the Sky Bet Great Voltigeur Stakes at York on Wednesday.
The Group 2 will bring some much-needed clarity to the William Hill-sponsored Classic with four of the five runners entered. Logician is a top price of 10-1 for the St Leger and second in the market behind ante-post favourite Japan, whose trainer Aidan O'Brien is represented at York by Constantinople and Norway.
Logician has not run since winning a Newbury handicap on July 4 off a mark of 90 at odds of 1-5 having won a Newmarket novice at 2-9 following a debut win in a Newbury maiden win in May.
The race's ante-post favourite still has something to find with his four rivals despite being raised 11lb for his Newbury success to a mark of 101.
Nayef Road and Constantinople, first and second in the Gordon Stakes at Goodwood earlier in the month, set the standard on BHA ratings.
Constantinople, beaten a neck by Nayef Road at Goodwood when giving the Mark Johnston-trained runner 3lb, reopposes off level weights.
Godolphin's Jalmoud is the only runner without a St Leger entry, having disappointed in the Gordon Stakes in a well-beaten seventh after finishing third to Japan in the Grand Prix de Paris at Longchamp.