Coulthirst has penned a three-and-a-half year contract at the ABAX Stadium after a series of loan spells.
Everton agreed a price with Leeds for highly rated defender, only for West Ham to later complete the deal.
IBTimes UK speaks with the 21-year-old forward's agent about his potential move to St James' Park.
The Hammers co-owner thinks the club now has the right manager in place.
The world number one Test bowler is recalled after Plunkett withdraws with a thigh strain.
Young is out for a 'long time', says the United boss.
The German has admitted the Reds are keen to improve their squad in the transfer window.
Arsenal defender Carl Jenkinson has spent the last two seasons on loan at West Ham United.
Byram sealed his move to West Ham after rejecting Everton.
Liverpool and Manchester City are also reportedly interested in the starlet.
Federer beat Grigor Dimitrov in four sets, while Williams needed just 44 minutes to see off Daria Kasatkina.
The 26-year-old forward has been on the injured list since December, but has recently returned to training.
Chelsea may be reluctant to negotiate any departure in the January window, however.
Brit plays Sousa in the third round at Melbourne Park. Find out where to watch the game live in the UK.
The 29-year-old Brit concedes the sport's reputation is close to hitting an all-time low.
Report claims Welsh forward could sign contract extension in the summer, dealing a blow to United's hopes.
Stan Wawrinka takes on Lukas Rosol in the Australian Open. Find out where to watch the game live in the UK.
Australia lead 4-0 and aim for a whitewash going into the 5th ODI in Sydney. Find out where to watch live in the UK.
Pardew says he wants to sign a 'big' player during the January window.
Royal Rumble 2016 airs live on Sunday 24 January on the WWE Network.
Ranieri says they are second in the league because traditional big teams are not at the top of their game.
John Stones has been subject to Chelsea interest from last summer with Everton rejecting four bids from the Blues.
The British number one is chasing his first Australian Open title in Melbourne.
Businessman Hollis has confessed the Midlands club is in a desperate situation.
45-year-old Spaniard is the world's most in-demand coach at the moment.
Luis Enrique's side can move to the top of the La Liga table with victory at La Rosaleda.
Manchester United are currently in fifth place in the Premier League, seven points behind leaders Arsenal.
Alex Teixeira, who has scored 26 goals in as many appearances for Shakhtar, has welcomed a move to the Premier League.
Goalkeeper returned to his hometown club on 31 December on an initial 28-day emergency agreement.
Lawrenson doesn't believe the Portuguese is good enough to displace Coutinho, Firmino or Lallana.