Velayudam Dayanidi, better known as Daya Master, the media coordinator of the Liberation Tigers of Tamil Eelam (LTTE) was admitted to a private hospital here early Thursday following chest pains.
"He is out of hospital and we are monitoring his movement from Colombo to (rebel-held) Kilinochchi," a spokesman for the Scandinavian truce monitoring mission said.
The hospital said he underwent tests and was given treatment. No more details were disclosed.
President Mahinda Rajapakse had granted tight security for Dayanidi following an appeal from his family to travel to Colombo for treatment after his family said he had suffered a heart attack.
More than 60,000 people have been killed in the separatist insurgency launched by the rebel Liberation Tigers of Tamil Eelam in 1972.
In 2002 they signed a ceasefire with the government but the truce has been breached by almost daily tit-for-tat attacks in the past six months. At least 850 people have died in the violence since December, according t