News and previews: Jockey Ruby Walsh is set to be out of action for up to a month after X-rays showed he has aggravated the injury he received at Cheltenham nearly four weeks ago.

Walsh was hurt when the Frances Crowley-trained Riverboatman fell at the second-last in the handicap chase at Gowran Park on Thursday.

The in-form rider missed the first two weeks of January after a double spill at Prestbury Park on New Year's Day.

"He has aggravated the injury he sustained at Cheltenham," said his sister and agent Jennifer Walsh. "He will be out of action for up to a month and during that time he will need physiotherapy consistently."

Meanwhile, Paul Carberry is scheduled to be at Cheltenham today for the Sir OJ ride in the Ladbrokes Trophy and in the process looks set to miss out on a Navan winner with Snow Tern in the second maiden hurdle, writes Brian O'Connor. Snow Term was an impressive bumper winner at Leopardstown over Christmas but was an expensive failure at Naas subsequently behind King Johns Castle. The extra half mile to travel today though should be right up his street.

Jazz Messenger is another Noel Meade fancy in the conditions hurdle where Christy Roche's Pierse runner-up, No Where To Hyde, reappears. He is a likely favourite again but if Gaza Strip is close to the leaders coming to the last then those who saw her finish like a bullet at Thurles last time out will fancy her chances.

Mark Pitman's Dempsey is strongly fancied to add his name to the illustrious list of winners in today's Victor Chandler Chase at Cheltenham. Pitman's charge obliged at Sandown earlier in the month but the winning margin of three-quarters of a length does not tell the full story as Dempsey idled up the hill to allow Tikram another chance.