Following the signings of Serbian pair Zoran Tosic and Adem Ljajic from Partizan Belgrade, Sir Alex Ferguson has declared 'that's it' for United's business in this transfer window.
21-year-old left-winger Tosic is likely to be handed a first-team run out this season, while 17-year-old Ljajic will remain on loan at Partizan until the end of the campaign. Carlos Tevez has warned Manchester United that he will leave if on-going contact negotiations are not resolved, but it's not likely he will move this January.
Stuart Downing's possible switch to Tottenham has dominated the early January transfer window talk. Spurs have launched two bids for the winger already, with a reported £14.5m bid turned down on January 7th. Boro Chief Executive Keith Lamb insists the club will not let Downing or any other senior player leave in the transfer window.
Newcastle's Alan Smith has been linked with Boro, as part of an unlikely swap deal involving Mido, while Jimmy Bullard and Celtic winger Aiden McGeady are said to be on manager Gareth Southgate's 'wanted' list.
Shay Given could be one of the major movers this January, having expressed his desire to leave St James' Park. Manchester City have tabled an £8m bid for the Irishman and Spurs also believed to be interested in the Irish stopper.
Joe Kinnear has described his shortage of central midfield options as 'serious', with Nicky Butt, Joey Barton and Danny Guthrie. Rangers star Barry Ferguson is rumoured to be on the verge of a £3m move to Newcastle, along with teammates Allan McGregor and Madjid Bougherra. Rangers deny this, saying they have no desire to let any of these players leave Ibrox.
Having lost both Jermain Defoe and Lassana Diarra in recent weeks, Pompey's odds on getting relegated this season have been slashed.
Despite the club's precarious financial position, Tony Adams admits funds raised by the sale of those players has to be re-invested in his squad. Former Fratton Park favourite Gary O'Neill has been linked with a £5m return from Middlesbrough, while Brazilian midfielder Edu could join on loan from Valencia.
Adams is also a known admirer of Newcastle's Joey Barton.
Stoke's FA Cup humbling at the hands of League One side Hartlepool United raised concerns over the strength of the Potters' squad.
Tony Pullis is closing in on the signing of West Ham winger Matthew Etherington and Aston Villa's Marlon Harewood.
It could be a busy month for Stoke, who are also trying to pull off the signings of Wigan's Henri Camara and Cardiff City's Joe Ledley.
Despite spending £50m during Roy Keane's tenure at the Stadium of Light, Sunderland continue to languish in the lower regions of the Premiership.
New boss Ricky Sbragia is set to be given £10m to improve his squad this month, with a further £20m set to be spent in the summer.
Sami Hyypia would offer the Black Cats' backline much needed experience, if the Finnish international could be prized away from Anfield. Marseille Modeste M'Bami is a reported forward target, with El-Hadji Diouf set to move on in the next few weeks.
Spurs have kept up with their tradition of spending big in January transfer window, recapturing Jermain Defoe in a deal worth up to £16m.
Harry Redknapp has spoken of his desire to bring a further three or four players to White Hart Lane sooner rather than later. Ghanian midfielder Stephen Appiah is currently on trial and would bring much needed solidity to Spurs if he can prove his fitness.
Lyon's Brazilian striker Fred could be brought in to be paired with Defoe upfront for the Lilywhites, while German forward Lukas Podolski and Celtic's midfielder Scott Brown are reported targets.
Redknapp is also chasing a left-back as cover for Gareth Bale.
With money at a premium at The Hawthorn's, Tony Mowbray is looking for loan signings to shore up his side until the end of the season.
Jay Simpson has been recruited from Arsenal on a temporary basis and Nancy striker Marc-Antoine Fortune is also set to arrive on loan.
Danish winger Peter Lovenkrands could arrive on a free transfer, having been released by German side Schalke.
West Ham desperately need to address their debts by selling as many players surplus to requirements as possible.
The likely sales of Luis Boa Morte, Matthew Etherington and Calum Davenport would generate around £8m. Craig Bellamy may also be sold if Manchester City or Tottenham if the price is right.
Former West Ham star Julian Dicks has urged the club to hold on to their stars, such as Bellamy, Matt Upson, Scott Parker and Robert Green, saying they risk relegation if those players are not maintained.
DW StadiumWigan are looking to build on their excellent position in the Premiership by adding further quality to their squad this month.
Colombian striker Hugo Rodallega is set to arrive in a £4.5m deal, providing he can secure a work permit, amid speculation Emile Heskey and Henri Camera could leave the JJB Stadium.
January Transfer Window Part One