Thiago was ever present in Bayern's run to European glory and started both legs of their last 16 tie against Chelsea, which Bayern won 7-1 on aggregate.
The Spaniard looks set to leave the Allianz Arena this summer and Liverpool have been heavily linked with his signature.
Reds fans will certainly be happy to hear Mount's assessment of the midfielder, having gone up against him twice last season, with the England international name checking Thiago as one of Bayern's "world-class players".
Reflecting on his first experiences of Champions League football and their mauling at the hands of Bayern, Mount told Sport Bible : "The Champions League is on another level. The games feel different.
"Bayern have some unbelievable world-class players... [Robert] Lewandowski, [Joshua] Kimmich and Thiago in midfield, I just couldn't get near him.
"They moved the ball around the team so quickly. When you're up against players like that you're thinking, 'How are we going to stop this?'
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"It was a big moment, it opened my eyes. It made me realise, 'This is the next level, this where you need to be'. And I am determined to work hard and reach that level.
"It was a tough lesson, but we've taken so much from that experience and we'll come back stronger.
"The Bayern team have been together for a very long time, they know each other inside out and they're all world-class players that have played hundreds of games; World Cups, Euros, big Champions League finals.
"They've been through it all so they had a big advantage over us younger boys. Obviously it's difficult to take a loss, but when you go through a game like that you learn so much, you learn so much more than if you win 3-0.
"It was a tough lesson, but we've taken so much from that experience and we'll come back stronger."