British and Irish Lions defence coach Steve Tandy confirmed on Monday that fly-half Finn Russell has returned to training following Achilles injury while Dan Biggar is scheduled to train on Thursday following a concussion.
Russell could be in contention for the British and Irish Lions' for the second test match against the Springboks after recovering from his Achilles injury. With Biggar undergoing return to play protocols after being concussed in Russell's return to fitness is well-timed.
"All being well, Dan should be available to train on Thursday and Finn will start to train with us today," Steve Tandy said.
"Finn could potentially be in the mix, we'll see how he pulls up. I know he's been reacting well to training."
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Wyn Jones pulled out of the matchday 23 before kickoff on Saturday with Tandy confirming that the prop is now in doubt for the second test.
"Wyn has a minor injury and will probably be doubtful for the Test match," said Tandy, who added there is no plan to call up any cover.