As reported by both The Times (Rory Smith) and The Independent (Sam Wallace), Fernando Torres's training was apparently cut short today after he complained of "muscular discomfort" in his leg.
The Spain striker, 29, did not complete the session at the club’s Cobham training base after complaining of muscular discomfort in his leg. He was initially assessed by Chelsea’s doctors and sent home to recuperate, and will undergo further examinations this morning.
-source: The Times
Wallace goes on to specify that it's a thigh problem - just couldn't handle all that new-found explosiveness, eh? - and both sources agree that this puts his participation Wednesday against Schalke 04 in substantial doubt. Since the extent of the injury is not known at all right now, we can only speculate whether he'd be available this weekend versus West Bromwich Albion, which will be the Blues' last action for two weeks thanks to (yet another) international break.
If the injury lingers, chances are that Chelsea would err on the side of caution with the striker who has shown reasonable form so far this season, and not rush him back so as to ensure a proper recovery. We do have plenty of depth of comparable quality in Samuel Eto'o and Demba Ba (remember Demba Ba?).