The Croatian midfielder could make his way to London Stadium before the August 31 transfer deadline
West Ham are close to sealing a €30 million (£26m/$35m) deal for CSKA Moscow star Vlasic after giving up on Jesse Lingard, Goal can confirm.
Manchester United's Lingard had an impressive six-month loan spell at West Ham last season, and David Moyes has made no secret of his desire to sign the 28-year-old on a permanent deal.
However, the Hammers have been looking at alternative targets just in case they cannot re-sign Lingard, with Vlasic now set for a return to the Premier League two years on from his departure from Everton.