Monchi officially joined the club last week, after ending a long-term association with Spanish club Sevilla that yielded an impressive nine major trophies during his 17 years as a director.
He now arrives in the Italian capital looking to bring similar success.
"Roma and president Pallotta have shown they mean business," Spalletti said. "Monchi was the best out there and they've brought him in.
"He's the one that everyone wanted and everyone was looking at. You only need to ask those who have worked with him and done transfer business with him."
At his first official press conference in midweek, the Spaniard had words of praise for the work that had already been done at the club - while he revealed that the presence of Spalletti had been one of the factors that had attracted him to the role.
"I liked what he said about us," Spalletti added. "His view is untainted as an outsider looking in - it hasn't been smeared by what people say around here and he said it with consummate professionalism and sincerity.
"He's come in and said he thinks Roma are doing a good job. Clearly we can improve but that's how we're seen abroad.
"I'm pleased to be able to work with the best director of football there is and I'll keep what he's said to me to myself."
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