The Uruguayan made his comeback with a spirited display during the Reds' 1-0 defeat by Manchester United in the Capital One Cup at Old Trafford on Wednesday evening.
"Seeing him come back into the squad is a big boost for us," Mignolet told the Liverpool Echo.
"Everyone knows the quality he has and it is what we need for Liverpool. Not only on matchdays but every single day in training.
"I see it every single day in training when I'm one-v-one with him and you see what he can do, so he will improve me as a goalkeeper as well.
"We know there's a lot more to come from him and I'm sure he will score goals and win games for Liverpool again."
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