But De Boer is more optimistic about van Dijk taking part in the tournament, although he admits the decision will be made by the man himself.
"We know he has eight weeks left. I don't know if that's enough," De Boer told a press conference, as reported by TeamTalk.
"I have spoken to him, he is back on the field. There can always be setbacks. A week or two of setbacks could mean he can't play games for Liverpool [this season].
"Then I can imagine that they say: "Nice and nice, but you just focus on next season."
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