"His condition remains static but not dangerous," Ahmed Raza Kasuri, a key member of Musharraf's legal team, told reporters outside the military hospital in Rawalpindi where he is being treated.
In comments aired live on TV, he said 70-year-old Musharraf was "under stress". Asked what exactly had happened to Musharraf, he said he would not like to go into details.
Kasuri said, "He was on his way to the special court when he suddenly had a depression, heart sink hone laga (his heart started sinking)."
The legal team is expected to get Musharraf's medical reports by Sunday evening and they would be presented in the special court on Monday, Kasuri said.
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Dawn News quoted its sources as saying that three vessels in Musharraf's heart "are blocked and he would either require an angioplasty or a heart by-pass".
The possibility of his treatment in Dubai or London was being considered, the report added.
The sources said Musharraf was being administered blood thinning medication. They said he had experienced extreme mental stress which led to chest pains and his current medical condition.
Aasia Ishaque, spokesperson of Musharraf's All Pakistan Muslim League (APML) party, said yesterday he had suffered a "severe heart attack". She said Musharraf was not feeling well since Wednesday night and doctors who visited his farmhouse gave him medicines and advised bed rest.
Musharraf is the first general to face trial for treason. If convicted, he could get life imprisonment or the death penalty.