Letlhaku, who is tied to a long-term deal at Sundowns, was used as a bit-part player last season, making just six appearances in the PSL and scoring two goals.
The South Africa under-20 international showcased his talent on the biggest stage in club football, the 2025 FIFA Club World Cup in June, as he grabbed an assist in Sundowns' 4-3 defeat to Borussia Dortmund.
The current season has seen Letlhaku feature as a substitute against Richards Bay in the MTN8 on August 4, with the likes of Arthur Sales and Tashreeq Matthews preferred ahead of him.
The youngster got an assist after setting up Siyabonga Mabena for the fourth goal as Masandawana claimed an emphatic 4-0 win.