Fallon sweet on O'Brien Arc duo Kieren Fallon fancies Aidan O'Brien's So You Think and St Nicholas Abbey to run huge races in Sunday's Prix de l'Arc de Triomphe. Former Aussie superstar So You Think is one of the market leaders for the Longchamp showpiece, and Fallon says most jockeys would love to ride him despite never having run over 12 furlongs before. Meanwhile he also thinks former champion two-year-old St Nicholas Abbey is the forgotten horse and could run a massive race at big odds. Writing in his column in the Racing Post Weekender, Fallon said: "Although this will be his (So You Think's) first stab at 1m4f I genuinely don't think it will be a problem. "Let's not beat around the bush, if you asked every jockey riding in the race who they would want to ride, I'll bet 90 percent would say So You Think and I am one of them." Meanwhile the four-year-old St Nicholas Abbey has failed so far to live up to the sky-high expectations that a brilliant juvenile campaign brought. He did win a Group One this season, the Coronation Cup at Epsom, but has since been beaten into third behind Nathaniel in the King George and Arc favourite Sarafina in the Prix Foy. Fallon though says it would be foolish to write him off completely, particularly at big odds. "For those of you who like to look at long shots there is one in the betting that seems to have gone under the radar of most experts and I reckon he would be a terrific ride around Longchamp - that is St Nicholas Abbey." Fallon believes the fact Aidan O'Brien's second string is proven over 12 furlongs will stand him in good stead in Paris on Sunday. "St Nicholas Abbey stays as well as anything in the field and, assuming plenty of use is made of him, he will make odds of 40/1 look rather silly."