Sunderland completed the signing of Will Grigg from Wigan on transfer deadline day.

Sunderland sign Will Grigg as Charlton lose key man: January's League One winners and losers

Sunderland left it late to complete their business on transfer deadline day - but how did their League One rivals fare in the January window?

We take a closer look at the division's winners and losers following a hectic month in the third tier.

Jack Ross has revealed how Sunderland will look to hit the goal trail

1. #Sat Feb 02 12:49:23 GMT 2019''[IPTC]Source=''[IPTC]Application\ Record\ Version=2''[IPTC]Copyright\ Notice=jpimedia''[IPTC]Object\ Name=First the winners... Sunderland''[IPTC]Caption/Abstract=It was a nervy deadline day for the Black Cats who finally signed Will Grigg from Wigan. Jack Ross will hope Grigg can fill the void left by top scorer Josh Maja, while Jimmy Dunne, Grant Leadbitter, Lewis Morgan and Kazaiah Sterling also came in.''[IPTC]Headline=First the winners... Sunderland

Jack Ross has revealed how Sunderland will look to hit the goal trail
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Despite losing their manager, Luton signed five new players in January. Midfielder George Moncur signed from Barnsley while striker Jason Cummings and defender Alex Baptiste arrived on loan.

2. Luton

Despite losing their manager, Luton signed five new players in January. Midfielder George Moncur signed from Barnsley while striker Jason Cummings and defender Alex Baptiste arrived on loan.
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In the final hours of deadline day, Rovers boss Grant McCann said he was going home and turning off his phone. Thankfully for him, Doncaster kept hold of top scorer John Marquis despite reported interest from Sunderland.

3. Doncaster

In the final hours of deadline day, Rovers boss Grant McCann said he was going home and turning off his phone. Thankfully for him, Doncaster kept hold of top scorer John Marquis despite reported interest from Sunderland.
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While three consecutive league defeats saw Kenny Jacketts side drop off the top of the table, Portsmouth did manage to sign six new players last month. Despite their recent wobble, Pompey look well equipped to continue their promotion push.

4. Hard to tell... Portsmouth

While three consecutive league defeats saw Kenny Jacketts side drop off the top of the table, Portsmouth did manage to sign six new players last month. Despite their recent wobble, Pompey look well equipped to continue their promotion push.
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