Mr Jatuporn said Nattawut Saikuar, the UDD secretary-general, was today checking out the suitability of Aksa Road, which connects Phutthamonthon Sai 3 and Sai 4 roads, to determine if there would be any problems if it is used for the red-shirt rally.
"If there is a problem, we still have an alternative rally point. We will definitely gather in Bangkok on April 5," he said.
Speaking to a red-shirt rally, Mr Jatuporn said April was likely to be the most crucial period of the standoff between the PDRC and UDD.
The standoff could drag on into the month of May, but the decisive period would be in April, he said.
"I believe that if we can demonstrate our force from the beginning, the critical period will be quickly overcome with the least damage caused. If we are too slow to act, it may be too late," he said.
Mr Jatuporn said the red-shirts must turn up for the rally in the largest possible numbers on April 5, and outnumber the PDRC protetsts. He expected the turnout to be in the tune of 500,000.
UDD guards would coordinate with police to ensure security, he said.
"Our responsibility is to fight against the ammart (aristocrat elite) who are behind PDRC's Suthep Thaugsuban and independent organisations, so that our country can move forward," he added.