Christian Pulisic has not featured for Chelsea for 61 days. The USMNT star suffered a knee injury in the 1-0 Premier League defeat to Manchester City in January but returned to training in recent weeks.
In his absence, Graham Potter's side have won just twice - two 1-0 victories over Crystal Palace and Leeds - while losing five. The Blues' season relies solely on today's UEFA Champions League second-leg tie with Borussia Dortmund.
The Bundesliga outfit currently lead the last-16 tie 1-0 after Karim Adeyemi's 63rd-minute solo strike. Edin Terzic's side have been in red-hot form since the World Cup, winning their last 10 games.