Yahoo Sport 
When the transfer window opens and closes in major Premier League change
The Premier League has announced the dates for the summer and January transfer window as Arsenal, Chelsea and Tottenham Hotspur gear up for a busy period of dealings.
Arsenal have enjoyed the most success out of teams in the capital this year after challenging Manchester City at the summit of English football. Spurs had the chance to influence the title race on Tuesday but fell to a 2-0 defeat at home to Pep Guardiola's side, handing the North West club a two-point lead at the top.
Ange Postecoglu will look to continue his ambition of changing the culture in North London, following criticism of the 'fragile' culture at the club. Mauricio Pochettino faces an uncertain future at Stamford Bridge after facing pressure over his position as Chelsea manager in recent months.
The Blues continued their free-spending nature under Todd Boehly as it exceeded £1billion following the 27 additions under the American. Despite their influx of talent, they have struggled to make an impact on the Premier League but could secure European football if Newcastle and Spurs drop points in their remaining matches.
When does the summer transfer window open and close?
In a rare twist, the transfer window close on Friday, August 30 at 11pm after closing in September last year. It has been confirmed that the date has been set in conjunction with major leagues in Europe following discussions with the EFL and the respective Germany, Spain, Italy and France governing bodies.
Arsenal have been linked with a wide range of attackers as they look to strengthen their strike options. It could be a busy summer for the Gunners with the likes of Thomas Partey and Kai Havertz linked with moves away from the Emirates Stadium, meanwhile they have been mooted as suitors for the likes of Ivan Toney.
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At Stamford Bridge, Thiago Silva is among the high-profile departures as he returns to Brazil following the expiry of his contract. Reece James and Ben Chilwell have suffered with their respective injury problems this season and the backline could be a department for bolstering in West London.
When does the summer transfer window open? Friday 14 June - Friday 30 August, 11pm
When does the winter transfer window open and close?
The last January transfer window was one of the quietest on record in the Premier League. With the points deduction for Everton and threat of one for Nottingham Forest, top-flight clubs were tightening their belts amid concerns over straying over the line and landing a penalty.
It remains to be seen what the landscape of the Premier League will be in January but the threat of Saudi Arabia's riches remains prevalent and they could look to snap up another key name from the region at the turn of the year.
When does the winter transfer window open? Wednesday 1 January - Monday 3 February, 11pm
