Urgent De Gregaine faces a crucial workout on Thursday morning as trainer Emmanuel Clayeux continues to ponder a crack at next week's Glenfarclas Chase at Cheltenham.The nine-year-old won the rehearsal event on Trials Day at Prestbury Park, but he was racing off a feather weight that day and Clayeux had expressed some doubts about his ability to shoulder a heavier burden at the Festival.However, the French handler is now leaning towards another cross-Channel foray, although Urgent De Gregaine needs to please in his work before plans are firmed up.Clayeux said: "Probably he will run, but I will make a definite decision on Tuesday."He will work in the morning and I will decide after that."