While the Blues have yet to add to their ranks so far in this window, the same can’t be said for some of those with promotion pack, with the likes of Hull, Sunderland and Fleetwood all dipping into the transfer market to boost their ambitions.
Hull have, however, seen two players also depart.
But their losses won’t be felt as hard as one endured at Doncaster Rovers.
The promotion-pushers saw highly-rated captain Ben Whiteman depart for Preston on Thursday, which will represents a huge blow to their Championship hopes.
A sizeable but undisclosed fee was obtained for the midfielder’s services, though, which means Donny boss Darren Moore will be keen to reinvest the money very soon.
Here's a look at what business was carried out by League One clubs over the past seven days...
13. Ryan Edmondson: Leeds to Northampton
The Leeds teenager has joined the Cobblers on loan until the end of the season. The 19-year-old striker made his Leeds debut at the age of 16 and spent the first half of this season on loan at Aberdeen. Picture: Pete Norton/Getty Images Photo: Pete Norton
14. Olly Lee: Hearts to Gillingham
The Hearts midfielder Olly Lee has signed for Gillingham on loan for the rest of the season. Picture: Pete Norton/Getty Images Photo: Pete Norton
15. Kyle Vassell: Rotherham to Fleetwood
The experienced forward has moved to the Cod Army on loan until the end of the season. The 27-year-old has made 14 appearances for the Millers this season. Picture: Jan Kruger/Getty Images Photo: Jan Kruger
16. Ben Whiteman: Doncaster to Preston
The Doncaster Rovers captain has signed for North End for an undisclosed fee on a three-and-a-half-year deal. The 24-year-old midfielder scored 25 goals in 159 games for Rovers and his departure will be a huge blow to Donny's promotion hopes. Picture: Pete Norton/Getty Images Photo: Pete Norton