Eddie Howe has warned that Newcastle's squad is not deep enough to compete on three fronts in its current state this season.
Ahead of Saturday's trip to Sheffield Wednesday in the third round of the FA Cup, the Magpies are third in the Premier League and entertain Leicester City in the Carabao Cup quarter-final on Tuesday.
Howe has been boosted by the return to training of Alexander Isak, the £60million striker who has been missing since October with a torn thigh muscle.
But injuries to defender Matt Targett and midfielder Jonjo Shelvey - both sidelined until February - have left them light in key areas.