KickOff.com reported earlier today that Celtic would be assessing the Kaizer Chiefs man in a match against the Crocodiles at Siwelele Park.
The home side managed to hold the Lesotho national team to a 1-1 draw with Celtic's goal coming courtesy of Vusi Shikweni.
Celtic interim co-coach John Maduka said after the encounter that he was impressed with the big Amakhosi striker.
"Yes [we were impressed], we drew 1- 1 and he [Mthembu] did very well," Maduka tells KickOff.com.
"He did what we wanted to see and the rest we hope it will follow."