Chelsea have been handed a significant boost for Sunday's clash at the Emirates after interim boss Guus Hiddink confirmed that both Eden Hazard and Diego Costa took part in training on Friday.
Hazard has not played since going off with a groin problem against Crystal Palace on 3 January, missing three games, while Diego Costa came off with a bruised shin in the latter stages of the draw with Everton last week.
Hiddink, however, said that both would be available to play Premier League leaders Arsenal, although they are not fully fit.
"The last two days he (Hazard) was in full commitment with first-team training, so he is available," said the Dutchman.
"We have to be careful, because he has fallen into some injuries recently.
"I'm not sure whether he can play a full 90 minutes yet. We have to consider whether it's best (for him) to start or to come in."
Costa had scans immediately after the draw with Everton, with the results showing no fracture and just bruising.
The Brazil-born Spain striker returned to training on Thursday.
Hiddink added: "He (Costa) was in yesterday. He was in today. So he will be available as well."
Additional reporting from PAReuse content