The youngster, who had only just returned from three weeks out with a knee injury, is expected to miss at least three months of the season, and has returned to White Hart Lane to be treated by Tottenham's own medical staff. Whether Marney will return to Norwich after his recovery period is over has not been made clear.
The news comes just as things had begun to look up for City, at least on the injury side. Youssef Safri and Adam Drury returned to action on Saturday, and Peter Thorne is reportedly close to full fitness. Leon McKenzie and Jason Shackell remain sidelined.
Nigel Worthington must now decide how to reshuffle his side, yet again, for the visit of Cardiff City tomorrow night. Ian Henderson played on the right of midfield against Queens Park Rangers but is more recognised as a striker. Darren Huckerby is right-footed, but prefers to play on the left. Worthington is likely to have to turn to a fringe player, possibly Matthieu Louis-Jean, in the short term, and may have to splash out when the January transfer window opens.
Marney's injury is the latest problem for the Canaries' boss, who has seen his side lose half of their league games and hover perilously close to the relegation zone. He must also face a potentially explosive AGM this evening.