Tottenham boss Ange Postecoglou has played down Heung-min Son's substitution in last night's Europa League win against Qarabag.
Son came off in the second-half of the 3-0 victory.
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Postecoglou insists the club captain was simply suffering from fatigue.
"I haven't spoken to him," Postecoglou said of Son. "He said he felt a bit tired but I haven't spoken to him or medicals yet."
Spurs meet Manchester United on Sunday.