Big Buck's beat Duc De Regniere on his reappearance in the Long Distance Hurdle at Newbury last month and Nicky Henderson's campaigner could reoppose. The trainer has another possible runner in Carole's Legacy.
Meanwhile, Stewart is fronting one of around 20 bids for the Tote, which provides between £11million and £20m a year to horseracing.
The City businessman said: "We submitted the bid on Friday and the government will come back to us in the second week in January."