Chelsea have been put through their paces in training as they prepare to face Jose Mourinho’s former side, FC Porto on Tuesday night.

The current Premier League champions face a tough game away in Portugal after they struggled to a point at St. James’ Park on Saturday evening.

Mourinho may decide to axe a number of his under-performing stars following the poor showing.

Diego Costa is eligible to start for Chelsea as his three-match ban doesn’t not apply for a European game.