Costa and Cahill were both forced off in the 2-2 draw with Barcelona on Wednesday.
Tottenham Hotspur are considering a move for Ashley Young should they fail to land Yannick Bolasie.
Chelsea take on Arsenal in the Community Shield on 2 August.
Jose Mourinho has publicly expressed his desire to sign Stones from Everton.
Daley Blind has revealed that he could have been on his way to Arsenal as a kid.
Arsene Wenger is a huge fan of the midfielder and has asked his recruitment team to keep a tab on Sergio Busquets.
Louis van Gaal is in the market to sign an attacking player in the hope of adding more speed in the final third.
Match played on different day but organisers rule game invalid.
Manchester United face PSG in the pre-season friendly fixture on Thursday. Find out how to follow the match live in the UK.
Former Barca academy player has a strong relationship with manager Luis Enrique.
Wenger also hit out at allegations from old rival Jose Mourinho that Arsenal are 'buying the title'.
Statistics reveal that no manager has spent more on signing players in the past 11 years than Jose Mourinho.
Former West Indies fast bowler says the Edgbaston pitch needs to support seam movement.
IBTimes UK sports editor Nick Howson previews the third test of the 2015 Ashes series.
The Belgium defender only made one La Liga appearance in his debut campaign at the Camp Nou.
Mourinho says the winger has shown impressive leadership skills at Stamford Bridge.
Yedlin made just one appearance for Spurs last year following his arrival from Seattle Sounders.
Gunners boss also rejects Jose Mourinho jibe that the club is trying to buy the title.
Brazilian international back at the Vicente Calderon after just one year at Stamford Bridge.
Chelsea play Barcelona in the penultimate game of the pre-season. Find out where to watch live in the UK.
Brendan Rodgers has mainly focused on strengthening his senior team ahead of the upcoming Premier League campaign.
Katarina Johnson-Thompson will compete in heptathlon and long jump and Greg Rutherford is included.
Blind had an offer to join the La Liga side on a free transfer in 2013.
Wenger added that Hazard is not in the same league as Lionel Messi and Cristiano Ronaldo.
Italy international cost £16m but failed to provide the goals or controversies of previous seasons.
Jose Mourinho insists that his side do not get the best decisions from referees.
Club legend previously said United need another marquee signing before they let Argentinian go.
Roy Hodgson says Raheem Sterling will be "stronger" and a better player at Manchester City.
Dobson has expressed his delight at signing for his hometown club after spending 10 years at Arsenal.
DR Congo star apparently keen on moving from south to north London if a bid is made.