Alvaro Morata has suffered a knee injury as Chelsea drew with MOL Vidi in a Europa League dead rubber.
The Blues, who had already won Group L to reach the last 32, made 10 changes although Willian, Morata and Cesc Fabregas were among the starters.
Willian opened the scoring with a free-kick before Chelsea teenager Ethan Ampadu headed into his own net.
Loic Nego put Vidi ahead with a fantastic volley but Olivier Giroud scored a stunning free-kick equaliser.
Morata hurt his knee while shooting from Callum Hudson-Odoi's cross late in the first half and had to be replaced by Giroud - who is now the Blues' only fit striker.
Boss Maurizio Sarri says he does not think the injury is too serious, with an update expected on Friday.