New Zealand have been hit by a second outbreak of mumps on their tour but are confident it has been contained before their final match against Wales on Saturday.

The flanker Ardie Savea is in isolation in the All Blacks’ Cardiff hotel after being diagnosed with the virus despite being vaccinated as a boy. He follows the wing Reiko Ioane, who contracted it earlier on the tour and after recovering, injured a shoulder in the win against Scotland last Saturday.

“Ardie has been in isolation for a few days and must have been in close proximity to Rieko at some point,” said the assistant coach, Ian Foster. “It has caught us on the hop a bit because it is not something that you get a lot of. We are taking it seriously and the doctor reacted really quickly.”

New Zealand will be playing their 15th Test of the year, a run which started against Samoa before the Lions series. They have lost Ioane, Luke Romano, Dane Coles and Jerome Kaino to injury this tour and their captain, Kieran Read, missed training on Tuesday.

“He is pretty battered after the last couple of matches and we took him out of training to give him an extra 24 hours,” Foster said. “He gets through a lot of work and at this stage of the season he is just a bit sore. He has had the chance to freshen up for later in the week.”

Read was criticised by the Scotland assistant coach, Dan McFarland, for a cynical act at Murrayfield that denied the home side a try. “I do not agree with that,” Foster said. “There was a spell when we were put under pressure and were penalised a lot. We infringed more than we would have liked and have to learn from that but Kieran’s record shows he is not cynical. We were not good enough and we have to fix it to take it out of the referee’s hands.

“We have learned a bit about ourselves this tour and we know we face a physical game against Wales. It is about the collision area when you play them.”

Foster knows Warren Gatland well: the pair were in the Waikato side who defeated Wales in 1988 but he was not prepared to comment on his former team-mate’s remarks that the New Zealand media employed underhand methods to try to undermine him during the Lions tour last summer.

“I have not heard or read the comments,” he said. “Gatty is well capable of promoting his own book and I will leave it to him.”

Wales lost their third Lions three-quarter of the season on Tuesday when Liam Williams joined Jonathan Davies and George North on the unavailable list having suffered an abdominal strain during the victory over Georgia.

With Hallam Amos and Steff Evans the likely wings to face the All Blacks, Wales are considering recalling Jamie Roberts in the centre.

“Jamie could come into the equation,” the Wales defence coach, Shaun Edwards, said. “Warren has three or four players to pick from in the centre. If Jamie played he would probably defend at 12, putting him head-to-head with Sonny Bill Williams in a sizeable inside-centre confrontation when New Zealand have the ball.”