Frank de Boer believes his side will struggle to fill the void left by the Denmark international should he complete a move to Tottenham
The club's technical director Marc Overmars revealed that Spurs have opened talks with the Eredivisie club over the signing of the Denmark international earlier this week.
De Boer has paid tribute to the 21-year-old's attitude and admits it will be tough to replace the attacking midfielder should he seal a switch to White Hart Lane.
"We always got along together very well. Footballers who are good players and also ideal professionals, are ideal players for a coach," the Ajax boss told De Telegraaf.
"His departure is a huge blow for us, because Chris is terribly important for us.
"[Whether we can replace him] depends on which player we can buy or take over on loan. They won't be at the level of Eriksen, but close to it."