Andy Murray's decision to miss the Davis Cup World Group tie against Argentina in Buenos Aires has been criticised by his brother Jamie.

The country's number one withdrew last week citing concerns over a knee condition but his older brother, who will play doubles in the first-round match which starts on Friday, is not impressed.

"It kind of affects the way we feel about him," Jamie told newspapers on Thursday. "I think it's disappointing he chose not to come.

"From what I have been reading he hasn't come out and said he's injured, it's more a prevention thing. I think if he had really wanted to push himself he could have come here for the match.

"It was a shock for me and for the team. I was not aware he had a problem."

Britain face a daunting task in Argentina without world number 11 Murray. Alex Bogdanovic, the team's next highest ranked player, is 188th in the world.

Argentina's team is led by world number nine David Nalbandian.