If West Ham United revive their interest in Carlos Bacca in January, Milan could raise the price-tag from €30m to €40m.
The Hammers had agreed a €30m transfer fee with the Rossoneri over the summer, then failed to work out personal terms with the striker.
Their difficult start to the campaign and struggle for Simone Zaza to settle could push them back on to the market for the Colombian hitman.
However, the Corriere dello Sport newspaper suggests if West Ham do come back asking for Bacca again, the price-tag could well be bumped up to €40m.
The 30-year-old has six goals in 11 Serie A appearances so far this season.
Their main target to replace him at San Siro would be Genoa striker Leonardo Pavoletti, who is also wanted by Napoli.