Lions injury update: Jones ruled out, Biggar return day set...

Russell suffered a small tear to the tendon against the Sharks on July 7 but was kept on tour in the hope that he would heal in time to play a role in the series against the Springboks.

"Finn will start to train with us today," defence coach Steve Tandy said on Monday.

The Welshman is currently undergoing return to play protocols after being concussed in Saturday's 22-17 victory in the first Test, placing his ongoing availability at fly-half in doubt.

"All being well, Dan should be available to train on Thursday," revealed Tandy.

Wyn Jones' prospects look less positive, however, after the Wales prop withdrew from the front row for the first Test because of a shoulder problem that is set to keep him on the sidelines.

"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.