The future Barcelona midfielder pulled up during Saturday's Eredivisie match, making him a doubt for the trip to Turin on Tuesday
Ajax appear to have suffered a major injury blow ahead of the second leg of their Champions League quarter-final against Juventus after Frenkie de Jong suffered aÂ hamstring injury against Excelsior.
Influential midfielder De Jong walked down the tunnel clutching the back of his leg inside the opening half hour of Saturdayâ€™s Eredivisie game, which Ajax led 1-0 through Klaas-Jan Huntelaar.
Huntelaar would go on to net a hat-trick asÂ Ajax earnedÂ a comfortable 6-2 win on the day.Â
But the bigger picture is not so rosy, with De Jong now looking like a possible absentee for Tuesday's trip to Turin.
Ajax bossÂ Erik ten Hag attempted to play down fears after the game, suggesting De Jong came off as a precaution.
"Frenkie's hamstring was playing up and we didn't want to take any risks," Ten Hag said.Â
Ten Hagâ€™s side claimed a 1-1Â draw at the Johan Cruyff ArenA this week, with David Neres cancelling out Cristiano Ronaldo's first-half opener.
De Jong established himself as one of the most sought-after midfielders in world football thanks to superb performances for club and country, and the 21-year-old will join Barcelona at the end of this season in a deal worth â‚¬86 million.
The current season also saw him break into the Netherlands set-up, where he has picked up seven caps to date since making his debut in September 2018.