Vertonghen has played in 20 out of 21 league matches this season, forming part of a defence that has conceded just 14 goals - the best record in the league. Pochettino, however, was unsure as to when attacking midfielder Erik Lamela would return to action. The 24-year-old has been sidelined since the end of October with a hip problem. "He will have a scan on Friday," he added. "Still it is difficult to give the time that he can come back. We need to wait tomorrow because there is still some problems, and we are still not sure of the diagnosis."