How long do Sunderland and Newcastle have to improve their squads before the transfer window closes?

Both Sunderland and Newcastle United need to strengthen their squads further as they battle relegation from the Premier League, with next year's bumper £5billion television deal up for grabs for the 2016-17 campaign.

Allardyce has already brought in defender Jan Kirchhoff on an 18-month deal from Bayern Munich, with striker Dame N'Doye also signing on loan.

Meanwhile, McClaren has added Jonjo Shelvey and Henri Saivet to his midfield options.

But when does the January transfer window close?

In England, the transfer window closes at 11pm on Monday, February 1, 2016.

How will window dates across Europe affect Premier League clubs?

One to watch out for...Any deals between Premier League clubs and players in Spain will have to be wrapped up 24 hours before the window closes in England - the deadline in Spain is 11pm (GMT) on January 31.

Meanwhile, the transfer windows in France and Italy close on the same day as in England, with the German transfer window shutting at 5pm on February 2.

How much is likely to be spent this year?

January 2015 saw Premier League clubs splash £130m on new players.

And that figure could be topped this year with the new television contracts up for grabs this summer.