POLL: Kone, Kirchhoff, Khazri or N'Doye - who has been the best Sunderland signing?

Sunderland manager Sam Allardyce this week hailed the impact of £5million January recruit, Lamine Kone.
Which of Sunderland's January signings has stood out for you?Which of Sunderland's January signings has stood out for you?
Which of Sunderland's January signings has stood out for you?

Centre-back Kone joined Sunderland in the last transfer window, along with versatile Jan Kirchhoff, wing wizard Wahbi Khazri and striker Dame N'Doye.

They have all made an impact but who is the best January signing?

On Kone, Allardyce beamed: "His (Kone’s) consistent level of performance has been miraculous considering he only joined us in January.