Comments of team leaders indicate growing unrest in a squad that seems to fear their ambitions could be disappointed when trying to repeat some of last season's success after winning the treble.
Porto currently have three Brazilians in their first-team squad: defender Alex Telles, midfielder Otavio and forward Evanilson. Enditem
The transfer window closes on October 5 and Koeman admitted he would like to see another central defender arrive before then.
Saturday's last game saw Danny Ings' fifth minute goal against one of his former clubs give Southampton their first win of the season with a 1-0 win away to Burnley.
Portu opened the scoring in the 55th minute from a tight angle after a pass from Mikel Merino, and Adnan Januzaj doubled the visitors' lead 13 minutes from time from the penalty spot after he had been clipped in the Elche area.
Italian qualifier Lorenzo Giustino claimed his first tour-level win in a more than six-hour marathon match against Corentin Moutet. It came close to breaking the 16-year-old record for the longest match at Roland Garros.
Fujian had little chance to score in the third set. Yang Yi then concluded the game with a serve.
Bayern started highly motivated in the encounter and took command while Hoffenheim kept 11 men behind the ball in the opening stages.
MADRID, Sept. 30 (Xinhua) -- A 65th minute goal from Vinicius Jr gave Real Madrid a 1-0 win at home to Real Valladolid in the fourth round of matches in La Liga on Wednesday night.
The game had already seen more than its fair share of drama after Solly March had headed Brighton level in the 95th minute, when it had looked as if a Lewis Dunk own goal and a cool finish from Marcus Rashford would give Ole Gunnar Solskjaer's men three points after Neal Maupay had put the home side in front from the penalty spot.
The first game of the day saw Alaves draw 0-0 at home to Getafe in a game that was more entertaining than the scoreline indicates. Both sides had chances to win, but the draw leaves Alaves with just one point from their first three games of the season.