"He’s been massive. He’s been a brilliant help," he told the club's website.
"When he came in, I was injured but he’s stuck by me you could say. He’s had faith in me and when the time has come, he’s put me in and had faith in me. I can only thank him.
"It’s always nice to come in and see the manager has faith in you from day one since I’ve been fit. That’s a massive boost for me – it’s great."
Flanagan also lifted the lid what Klopp is like away from the cameras, on the training pitch.
"He’s exactly the same. He is brilliant to work with," he added.
"Every day he is on it in training. You might see the funny jokes and things like that with the media, but he is on the ball every day with all the lads, not just me."
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