Ernesto Valverde believes the hamstring injury sustained by Barcelona defender Samuel Umtiti was decisive as his side drew 2-2 with Celta Vigo on Saturday.
The Liga leaders failed to win a home league game for the first time in a year, with Maxi Gomez's equaliser for the visitors coming after Umtiti pulled up injured.
| Barcelona v Celta de Vigo |
| Lionel Messi to score first | 8/5 |
The French defender is set to miss El Clasico against rivals Real Madrid on December 23, while Andres Iniesta was also replaced with an unspecified problem shortly after half-time on a bad day for Barca, which was later compounded by Atletico Madrid's last-gasp home win over Real Sociedad.