The Blues top goalscorer is reportedly winning his race to shake off the groin problem which kept him out of Spain’s midweek friendly with England.
Diego Costa is expected to hand Chelsea a timely selection boost ahead of their return to Premier League action, according to reports in The Sun .
The Spain international was forced to sit out a midweek friendly date with England after picking up a groin injury.
He was sent back to Stamford Bridge after aggravating the problem in training and was considered to be doubtful for a trip to Middlesbrough with his club side on Sunday.
Costa is, however, said to have responded well to rest and treatment and could be at Antonio Conte’s disposal this weekend.
The 28-year-old striker was able to take part in a training session with his Chelsea colleagues on Wednesday and is now in contention for a starting berth at the Riverside Stadium.
The Blues could certainly do with him in their line-up, as he is the Premier League’s leading goalscorer at present with nine efforts to his name.
His rejuvenation this season has mirrored that of his domestic employers, with the Brazil-born frontman back to his buccaneering best.
Chelsea have benefited from his efforts in the final third, while a tactical tweak to a 3-4-3 formation has sparked a surge up the English top-flight standings.
A five-game winning streak has lifted the west London club into second spot, with a productive sequence of results seeing them net 16 times without reply.
Conte will be hoping that momentum can be maintained after the international break, and will be delighted to have Costa as part of his plans if he is cleared for duty.
The Italian will also be looking to call upon the services of Eden Hazard, Cesar Azpilicueta and Thibaut Courtois after they were returned to him nursing slight knocks.