Koulibaly seemed to confirm that Sarri would be the next Chelsea coach before any official announcement was made, and spoke highly of the Italian.
It is also claimed in the same story that Chelsea FC legend Gianfranco Zola is poised to take up a role as Sarri's assistant boss at Stamford Bridge for next season. He has proven himself able to still compete at the top level.
However, the Blues did manage to end the season on a high by winning the FA Cup. The 31-year-old scored 22 goals in all competitions and provided 9 assists for the side as well.
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Chelsea are expected to announce their decision on a new manager soon with Sarri making much of the headlines as Antonio Conte's replacement.
After failing to retain the Premier League title, Conte came under pressure at Chelsea, and the latest reports indicate that the Blues are prepared to pay €5m (£4.4m) to release Sarri from his contract at Napoli.
In each of his two summers in charge, Conte tried to convince Chelsea to sign Belgium forward Dries Mertens. One main reason for this downfall has been the shaky Chelsea back line that has conceded way too many goals this season.
Mertens showed what he's all about with a wonderful volley in Belgium's 3-0 win over Panama on Monday and the Telegraph's report adds that Sarri believes he would be "the ideal man" to line up on the right of a front three. Something on everyone's mind is guessing where Eden Hazard will be next year.