Manchester United have revealed that a decision on whether Wayne Rooney will feature in the first game of the 2014 season at Old Trafford cannot be made until the day of the game.
Moyes was quoted on the club's official website ahead of the match, saying: "He didn't train today (Tuesday) so we'll assess him tomorrow and see how he is."
Spurs fans will be hoping that Rooney will not feature in the first game of the New Year, after suffering a thigh injury in the Champions League win over Shakhtar Donetsk earlier this month, which has niggled at him over the Christmas period.
Tottenham's new boss Tim Sherwood has got the north London side scoring more goals, which they lacked under previous manager Andre Villas-Boas, and Moyes is rightfully wary of Spurs' new-found attacking style of football.
"They have a really good side, spend well and always try to reward the manager with the players required," the Manchester United manager added.
Moyes also revealed that Robin Van Persie would not be ready to return to the side, which could signal another start for in-form England striker Danny Welbeck, having scored four goals in his last 4 league appearances for the Red Devils.
Rooney will almost certainly be fit for the following league game against Swansea ten days later, with Van Persie also expected to return by the time the champions meet their Welsh rivals.
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