Djenepo, who also joined in the summer, bagged his second goal of the campaign to give Saints a win over Sheffield United.
Having already produced two match-winning strikes, Adams is backing the £14m winger to be a success on the south coast.
Adams explained: “He does it in training all the time. We know what he can bring and that's why the manager brought him into a more attacking role.
“From when he stepped in the door, you could see he has the ability and that's why the club signed him.
“It's important if you're an attacking player, you need to be able to cause opposing teams problems and he's shown that.
“I think he will be a massive player for us, he's an attacking threat, and that's what we need. He will help us in the league."