Tottenham have been dealt a blow to their hopes of reaching the Europa League semi-finals ahead of their game away at Eintracht Frankfurt.
Ange Postecoglou revealed that captain Son Heung-min has not travelled for Thursday's last-eight second leg.
Spurs were held to a 1-1 draw last week at home, a game in which Son started and played 79 minutes before being hooked for Pape Sarr.
Winning the Europa League would spell the end of Tottenham's 17-year trophy drought, having last won the EFL Cup in 2008.