Chelsea boss Graham Potter has warned that building N'Golo Kante's match fitness back up will be a 'complex' process after the midfielder finally returned to training.
Kante was seen going through the gears at Cobham last week for the first time since September, having spent the last six months out of action with a hamstring injury.
'It's a complex one with [Kante] because he has had a long time out,' Potter said at his pre-match press conference before Chelsea's Champions League last-16 second leg against Borussia Dortmund on Tuesday.
'It'll be a case of how we get him back up to speed to play Premier League or Champions League football.