Alun Wyn Jones has been ruled out of the British and Irish Lions tour to South Africa after suffering a dislocated shoulder in the 28-10 victory over Japan.

Skipper Jones suffered the injury while being cleared out of a ruck and was escorted from the pitch by medics.

Head coach Warren Gatland will now have to name a replacement and new captain. Ireland and Leinster lock James Ryan is among the frontrunners to fill the second row vacancy.

"His shoulder dislocated. We're getting it scanned but it's looking like we'll have to replace him," Gatland said of Jones.

"It's very disappointing. He's been around rugby long enough but he'll be gutted. We need to call someone in, get them PCR tested and hopefully get them on the flight tomorrow."

The Lions will also be concerned about the fitness of Jones' Wales team-mate Justin Tipuric.

The back row headed down the tunnel in the 22nd minute after damaging his shoulder in a tackle and now faces an anxious wait to see if he will be fit for the tour.

"Justin got a stinger in the shoulder so we're going to check to make sure on a scan that there's no nerve damage," Gatland said.

Justin Tipuric leaves the field following the injury

"If there was any nerve impingement or damage then that could rule him out, but at the moment we're pretty confident he'll be OK and it's just a stinger in the shoulder."

The challenge now facing Gatland is to prevent the dire setback of losing Jones, a veteran of four Lions squads, from affecting morale.

"No one is in shock because if you're in shock its reflects back into the whole squad," said the Kiwi, who revealed that Ireland and Leinster number eight Jack Conan carried a hamstring injury into the game.

"We understand things are different and fluid and we have to move on and be able to react and make decisions and that is the only way you can deal with it.

"If you go into a shock scenario and look as if you are panicking then it will reflect badly on us.

"It's disappointing for Alun Wyn and also for Justin Tipuric if he is not right, but we have to do it right.

"Let's make the right decisions and do it as quickly as we can in the calmest way that we can."