Juve also retain interest in Manchester United attacker Anthony Martial as they consider a replacement for Alvaro Morata.
Morata has spent the last two seasons on-loan at Juve from Atletico Madrid.
Sky Italia says Morata has, however, returned to Atletico after the Italian side passed up on their £29.7m option to sign him permanently when his two-year loan expired in June, as they want to try and negotiate a lower fee.
United forward Martial was of interest to Juve back in the January transfer window before he eventually joined Sevilla on loan.
Unsettled Chelsea striker Werner is attracting tentative interest from former club Red Bull Leipzig, who received £49m for him when his release clause was met by the Blues two years ago.
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