Barcelona midfielder Andres Iniesta has missed practice because of an injury worry to his left leg.
Barcelona's 2-1 loss at Ajax Amsterdam last week was down to a lack of intensity while Sunday's 1-0 reverse at Bilbao exposed their relative physical frailty.
Barcelona lost their second straight game without injured star Lionel Messi when Athletic Bilbao handed the defending champions a 1-0 loss.
Barcelona will be missing defenders Carles Puyol and Dani Alves for Sunday's Spanish league game at Athletic Bilbao.
Athletic Bilbao host Barcelona sniffing an upset after the La Liga leaders suffered their first defeat of the season at Amsterdam in the Champions League.
Messi sustained the injury in a La Liga match at Real Betis on November 10 and is likely to be sidelined until the middle of January.
Coach Gerardo Martino and captain Carles Puyol have demanded more intensity from the players after Tuesday's 2-1 Champions League defeat at Ajax Amsterdam.
Chelsea qualified for the Champions League's last 16 despite being tripped up again by Basel, while AC Milan and Arsenal claimed easy wins.
Ajax stayed in contention for the last 16 of the Champions League after becoming the first side to beat Barcelona this season with a 2-1 win.
The Dutch side, on four points, lie third behind already qualified Barcelona, who have 10 points, and AC Milan, who are on five.
Barcelona's already injury-hit squad has received another blow with full back Adriano ruled out of Tuesday's Champions League game.