Lampard admits Mourinho was fuming after their defeat at Newcastle United.
He told talkSPORT: "He is who he is. He used to get quite upset and quite vocal with a loss, but I always liked that about him because then you know where you are. Some managers don't say anything after a bad result, and you're left wondering what they're thinking. For me, one of the beautiful things about him is his personality - and that hasn't changed.
"I was delighted he came back because I knew what a great manager he'd be for the club and for me. At that later stage of your career, it's great to have a manager you trust and who understands you - and you understand him. We have a lot of young players here too. They need direction, a good leader and someone to take them forward. For me, he was the man that was going to do it."
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