Jesper Olsen said there is "no doubt" Hakim Ziyech will be a success for Frank Lampard's Chelsea after leaving Dutch giants Ajax.
Ziyech is preparing for his first season in the Premier League following his £33.3million arrival at Stamford Bridge from Ajax in July.
The Morocco international winger, who provided at least 10 assists in each of his six previous campaigns in Amsterdam, impressed in his first appearance for Chelsea as the Blues drew 1-1 against Brighton and Hove Albion in last week's friendly.
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Olsen, who won back-to-back Eredivisie titles and the KNVB Cup during his time with Ajax between 1981 and 1984 before joining Manchester United, told Stats Perform News: "There's no doubt he will be a success at Chelsea.