In a statement, Al-Shabab claimed they had killed more than 63 Kenyan "crusaders".
If the death toll is confirmed, it would be the highest number of casualties Kenya's military has suffered in a single incident since its troops invaded southern Somalia in October 2011. A Kenyan official said on Sunday the army would issue a statement without saying when.
Earlier, Al Shabaab said that it had captured some KDF soldiers during the attack on Friday.
Speaking after receiving four injured KDF soldiers airlifted to Nairobi for specialized treatment, Chief of Defense Forces, Gen Samson Mwathethe and Defense CS Raychelle Omamo said the terrorists orchestrated the twin attacks on two camps (KDF and Amisom camps) using three vehicle-borne improvised explosive devices (VBIED) commandeered by suicide bombers.
The militants say the attacks are retaliation for the Kenyan military presence in Somalia and "war crimes" committed by Kenyan troops.
Ahmed and Yusuf continued to train and fight with al Shabaab, prosecutors said, and Yusuf appeared in a propaganda video filmed in Mogadishu urging people to fight on behalf of the militant group.
A coffin draped in the national flag is carried away from the aircraft by military pallbearers, at a ceremony to receive the bodies of four Kenyan soldiers who were killed in Somalia, at Wilson Airport in Nairobi, Kenya Monday, Jan. 18, 2016.
"We resisted. We have casualties but they too have casualties", said General Mwathethe. Al-Shabab has also launched several deadly attacks in Kenya.
The Prime Minister also stressed that the cowardly terrorist attack by Al Shabab will not deter nor hamper the government's astute plan in eliminating and eradicating the remnants of the terrorist group from the whole country.
Kenyan President Uhuru Kenyatta said on Friday that "some of our patriots in uniform" were killed.
"With our allies, we will continue in Somalia to fulfill our mission", he said in Friday's comments.
MOGADISHU Somalia (Xinhua) - Somalia's Islamist militant group Al-Shabaab claimed on Sunday to have killed 100 Kenyan soldiers serving under the AU mandate in the Horn of Africa nation following the Friday attack in the Gedo region.