A busy winter transfer window comes to a close on Monday when teams across Europe's top five leagues will have to finalize deals that they hope will improve their squads during the second half of the season.

Title challengers, European contenders and relegation-threatened sides have one last chance to sign players before the window closes - here are some of the potential talking points.

The January transfer window is poised for a thrilling conclusion as the likes of Arsenal, Chelsea, Manchester United and Tottenham are all working hard to complete deals before the deadline. The biggest names involved look set to be Aston Villa striker Ollie Watkins - who has been the subject of a rejected bid from the Gunners - and Bayern Munich forward Mathys Tel - who is of interest to the likes of Spurs and Chelsea,