Chelsea announced the signing of Hakim Ziyech earlier this week with the Ajax forward set to join his new team-mates in the summer.
The £36.7m fee is considered a bargain by many considering the Moroccan has managed 48 goals and 82 assists in just 160 games for the reigning Eredivisie champions.
The Blues are currently well placed to remain a Champions League side when the 26-year-old is formally announced ahead of the new season, with Boulahrouz expecting big things.
However, he reckons Ziyech would not have fitted Maurizio Sarri’s style last season with Lampard now the perfect manager to get the best out of him.
The former Chelsea defender told Tribal Football of Lampard: “He is a player who wants to play football forward. With football that fits Ziyech.
“You can see that in the players around him. Mason Mount, Willian and Tammy Abraham promote the vision of Lampard and that is important for Ziyech.
“Even in the Premier League, Chelsea wants to solve everything by playing football. That is also nice for the ordinary football fan.
“I think the Chelsea before Lampard would have been less suitable for Hakim.
“Then the football there, as I call it, was not positive.
Chelsea manager Frank Lampard is worried that his side will miss out on Champions League qualification
“Because of the temporary transfer ban, they were able to take the time at Chelsea to view players. That they end up at Ziyech also says something.
“Ziyech didn’t just choose a club.
“He has been very satisfied with Ajax in recent years and in that period the necessary clubs have also come along.
“Now at Chelsea he ends up with a team where everything is perfectly arranged and in a city where it is great to live.”
Hakim Ziyech will join Chelsea from Ajax this summer after a £36.7m deal was agreed
Ahead of their clash against Manchester…