The 27-year old Italian striker, who joined from Roma in the summer, has scored in his past two Saints outings and the boss is expecting him to continue improving and adapting to the English game.
"We believe Dani still has a big margin to improve. He is the middle of that process of growing and adapting to this league," he said.
"The goal he scored against (Manchester) City puts him on the right path but he still had to learn, has to improve and has to mature."
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