What should One say to the Host if an Invited Person is Accompanied by an Uninvited Person

Abu Mas'ud Al-Badri (May Allah be pleased with him) reported:
A man prepared some food especially for the Prophet ﷺ and invited him along with four others. But a man accompanied him. Having arrived at the door, Messenger of Allah ﷺ said to the host, "This person has followed us. You may allow him, if you like, and if you like he will return." He said: "O Messenger of Allah, I allow him, too."

[Al-Bukhari and Muslim].

عن أبى مسعود البدرى رضى الله عنه قال: دعا رجل النبي ﷺ لطعام صنعه له خامس خمسة، فتبعهم رجل، فلما بلغ الباب، قال النبي ﷺ: "إن هذا تبعنا؛ فإن شئت أن تأذن له، وإن شئت رجع" قال: بل آذن له يا رسول الله . .