Tottenham are "short in a couple of areas" and "need to reinforce" during the January transfer window, says manager Ange Postecoglou.
Spurs have lost three of their past four Premier League games to slip to 11th in the table, and were beaten 6-3 at home by Liverpool on Sunday.
That run has coincided with injuries to key players, including goalkeeper Guglielmo Vicario, and defenders Micky van de Ven and Cristian Romero.
Speaking before the club's trip to fourth-placed Nottingham Forest on 26 December, Postecoglou confirmed the club intend to strengthen in January.