Diego Costa has been dealing with some hamstring issues all season, but to date, he hasn't let them slow him down at all. Not only is Costa training and playing through the ongoing injury, he's even refusing extended rest when offered to him by Jose Mourinho. Here's what the Chelsea manager had to say about Costa during Friday's pre-match press conference:

"The Spanish team played in Luxembourg on Sunday, I gave them Diego, Fabregas and Azpilicueta. I gave them two days off." "I gave them Monday and Tuesday off, so they have to report to train on Wednesday at 3pm. And Diego was here on Monday at 9am." "So you can imagine how strong he was to be here on Monday."

While it might be for the best if Costa was to take advantage of the extra rest when offered, it's kind of nice to see a striker so hungry to compete that he refuses to take the time off even when injured. That sort of work ethic helps explain why the forward has gotten off to such an incredible start to life in the Premier League.