Associate coach Mark Slessinger will lead the Sycamores in Graves' absence to start the season.
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Tottenham boss Thomas Frank has been speaking to the media before Wednesday's Champions League game against Monaco at Stade Louis-II (kick-off 20:00 BST). Cristian Romero has an abductor strain and will miss the match, alongside fellow defender Destiny Udogie, who didn't travel because of a "knee irritation". Brennan Johnson is yet to score this Champions League campaign and Frank believes getting the best out of the forward is about "making it fit".