Musannaf Ibn Abi Shayba 3:3188

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Hammam, he said: I heard Qatadah saying regarding a man who began [the prayer] with the Imam on the day of Friday, but was unable to perform bowing or prostration until the Imam had finished praying. He said: Al-Hasan and Ibrahim used to say: He prays two rak'ahs, meaning on the day of Friday.