It's true. Maybe even 6 months. It happened after a clash with NEC's goalkeeper Roorda.
But Ajax isn't lost. At the start of the season, they had Machlas and Arveladze. Both are good strikers. Everyone had their own thought about it (Ajax, only playing one central striker, had to move one to the bench), but in the end there never was a "contest" between the two of them. Arveladze was soon injured a out for a few months, and just when he returns, Machlas is injured.
He won't be in action this season anymore, but he will definitely be back before next season's half-way stage, he will not miss much of next season, I'm sure.
At least he won't have to worry about missing Euro 2000.