In the recent defeat at Spurs, however, Costa looked sluggish on occasions with the general consensus suggesting that the busy festive period may have caught up with him.
In Spain, where Costa hit prominence with Diego Simeone’s side, he was given a lengthy winter break and the chance to recharge his batteries ahead of the so-called business end of the season.
The Premier League, on the other hand, doesn’t allow for such indulgences and with Costa seemingly in need of a breather, Mourinho has hinted he will grant his striker his wish.
“I have Remy and Drogba and maybe I put Diego on the bench and I play Didier or Remy,” Mourinho told the club's official website.
Remy and Drogba have only started three Premier League games between them this season, contributing five goals in the process.
It remains to be seen which striker Mourinho will opt for the visit of Watford, and it may not come as a total surprise to see both share the Stamford Bridge pitch at some point on Sunday.