Arsenal manager Arsene Wenger admitted Yaya Sanogo's struggles in front of goal are becoming an increasing problem, but refused to offer any guarantees he will delve into the transfer market for a new striker.

Celtic manager Ronny Deila insists no more players will be leaving the club as speculation continues to surround the future of certain members of his squad.

Real Madrid captain Iker Casillas slammed his side's performance after they let a two-goal lead slip to lose 4-2 at Real Sociedad on Sunday.

Germany midfielder Christoph Kramer has admitted he will probably never regain his memory of the time he spent on the field before coming off with concussion during the World Cup final.

"The doctors are certain that my memories of that part of the World Cup final will not come back," the Borussia Moenchengladbach player said in an interview with the weekly magazine Focus.

La Liga champions Atletico Madrid recorded their first victory of the campaign with a hard-fought 2-1 win over newly-promoted Eibar on Saturday.

First-half headers from Miranda and Mario Mandzukic ultimately proved decisive, but Atletico were given a scare after Abraham's brilliant strike had brought Eibar back into the game.

Massimiliano Allegri silenced the doubters as champions Juventus beat Chievo 1-0 in the former AC Milan coach's first Serie A game in charge of the Old Lady of Turin.

Last season's runners-up Roma also began with a victory as Rudi Garcia's team beat Fiorentina 2-0, with Radja Nainggolan and Gervinho grabbing the goals.

Louis Van Gaal admitted Manchester United are playing well below the standards he demands after his spluttering side were held to a 0-0 draw by Burnley on Saturday.

Van Gaal heads into the international break still waiting for the first victory of his United reign after two draws and a defeat in the Premier League, as well as a humiliating loss at third-tier Milton Keynes Dons in the League Cup.

Novak Djokovic and Andy Murray stayed on course for a mouth-watering U.S. Open quarter-final showdown Saturday as five-time women's champion Serena Williams stood alone as America's last singles title hope.

But as the heavyweights of the sport eased into the fourth round, the women's draw was blown open again when Wimbledon champion Petra Kvitova became the fifth top 10 seed to exit in the first week.

Manchester City manager Manuel Pellegrini said his side were entering the international break dissatisfied with their start to the season following a surprise 1-0 home defeat by Stoke City.

City were well short of the form that delivered the Premier League title to the Etihad Stadium last season, falling to a fine second-half goal from former Manchester United forward Mame Biram Diouf in Saturday's game.

Chelsea manager Jose Mourinho hailed Diego Costa as the complete striker after his side's 6-3 Premier League win over Everton but is concerned opponents will try to get the Spain international sent off.

Brazil-born Costa scored twice in a thrilling match at Goodison Park to take his tally to four goals in three games, and maintained Chelsea's winning start to the season.