The 17 year-old midfielder entered the fray just past the hour mark as Spurs enjoyed an impressive 2-0 Champions League win in London.
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Frank said afterwards: "No (he didn't look out of place), no, not at all.
"Jun'ai has impressed throughout the training. The players trust him. Clearly they rate him highly. I rate him highly. One thing is to get your debut for Tottenham, the last five minutes, 4-0 up and everything is smooth.
"Another thing is to get your debut in the Champions League, a big night against Dortmund and we needed to win the game. And he just came in, composed, calm, on top of this. Wow. I hope his parents are very proud. They should be."