It is still relatively rare for the best colts on the Flat to continue racing into their four-year-old season, but the French-trained duo Sagamix and Dream Well are set to buck the trend this year. The unbeaten Sagamix, winner of the Prix de l'Arc de Triomphe, is to continue racing in 1999 - and connections are targeting British Group One events in a bid to enhance his reputation and stud value. Already, the Dubai World Cup has been dismissed by trainer Andre Fabre, but the French master-trainer reckons the Coronation Cup at Epsom in June and the King George VI and Queen Elizabeth Diamond Stakes at Ascot in July are two obvious features at which to aim. A spokesman for the owner, Jean-Luc Lagardere, said: 'Sagamix is in superb condition and will almost certainly start his campaign in the Prix Ganay [May 2]. There is exceptional prestige to be gained by winning an English race, so we are looking at the most suitable options for our colt in the Group One category.' Dream Well, winner of the Prix du Jockey-Club at Chantilly, and perhaps more significantly, the Budweiser Irish Derby at The Curragh, failed to reproduce his best form at the back end of the 1998 season. However, obvious races for the Niarchos family's star are Ascot's King George and the Arc, in which the colt ran on very late down the outside in last year's running, won by Sagamix. Paul Carberry, whose ability to coax the best out of even the most unco-operative partners still amazes, has a new assignment in tomorrow's Hennessy Cognac Gold Cup at Leopardstown. He is to ride the talented-but-disappointing Boss Doyle, currently a 16-1 chance in ante-post betting. Trainer Mouse Morris chose Carberry as the replacement for suspended Shay Barry, passing up the opportunity to book Tony McCoy. 'It could have been Tony, but we've gone for Paul Carberry instead. That's just the way it has worked out,' Morris explained. It will be 12 months to the day that Boss Doyle ran the race of his career to finish second to Florida Pearl in a novice chase at Leopardstown. He was beaten only a length by the Willie Mullins-trained 'star', trying to concede seven pounds; it was a task clearly too great. Big things were expected from Boss Doyle this season but he has failed to recapture his old form. He ran in snatches when quietly fancied in the Hennessy Gold Cup at Newbury in November - but if Carberry can rekindle the gelding's interest, he clearly has the ability to figure in the frame. To put his chances into perspective, it is interesting to note that while Boss Doyle is at 16-1, Florida Pearl has firmed to 4-5 favourite for tomorrow's race - and the latter is also favourite with most firms for the Tote Cheltenham Gold Cup next month. This is the most important Gold Cup trial of the season. Florida Pearl will almost certainly firm up in betting if he shakes off the effects of his previous start fall at Leopardstown and wins well. Teeton Mill, the other contender for favouritism, is rumoured to have suffered a setback - although this has been denied by trainer Venetia Williams.