#1 Erik Lamela
The Argentine midfielder arrived at White Hart Lane in August 2013 for hefty fee of around £25 million; a fee that arguably, has not been justified. Lamela has made 86 Premier League appearances for Spurs, but only 10 since the beginning of the 2016-17 season.
His Spurs career has been setback by injuries, and therefore he hasn't been able to reach his full potential in the Premier League. He recently returned from his most recent injury, and came off the bench against Leicester on Wednesday in which he registered an assist.
The attacking midfielder has showcased his talent previously, but after so many injuries, the questions of his current ability are being asked; and with the current players Spurs have, Lamela will struggle to gain a place in the Spurs starting XI.
If it proves too hard for Lamela to regain regular football at Spurs once again, he may look for a move come January; whether it be a loan or permanent. At only 25-years-old, his career is far from over, and to kick-start his career once more, a January transfer may be tempting for the Argentine.