Ajax are insisting on €100m from Manchester United to sell Antony.
United had an offer of €80m rejected by Ajax last week.
Antony is upset with Ajax's stand and trained away from the senior squad on Friday. He is also out of today's squad for the clash with Sparta Rotterdam.
De Telegraaf says Antony could go on strike for the remainder of the summer transfer window.
However, Ajax's board are refusing to budge on their valuation.