According to German media, Ajax has already offered Werder Bremen midfielder Klasen a price of 12 million euros.
Ajax hopes to introduce a new midfielder before the summer transfer window closes, and they decided to sign back to Clarkson.
The report claims that Ajax has made an offer of 12 million euros, and the contract between Klarsen and Werder Bremen will expire in the summer of 2022.
The 27-year-old Clarkson joined the Ajax youth academy in 2004. He was the team captain.
Klassen joined Werder Bremen from Everton in the summer of 2018. He has made two appearances in the Bundesliga this season and he also made one appearance in the German Cup.