Argentina v Great Britain
Jamie and Andy Murray together at a tournament in Paris last year
Date: 8-10 February (1300 GMT)
Venue: Parque Roca, Buenos Aires
Coverage: Live on BBCi, BBC TWO and BBC Sport website (UK users only)
Jamie Murray has criticised his brother Andy for pulling out of this weekend's Davis Cup tie in Argentina.
British number one Andy Murray, 20, withdrew last week, citing recurring knee problems for the decision.
But Jamie said: "It was a shock to me and for the team, very disappointing - I was not aware he had a problem.
"It's disappointing he chose not to come and it kind of affects the way we feel about him. If he wanted to really push himself he could have come here."
Andy Murray said he was advised not to play on clay in Argentina after playing on hard courts in Australia and before playing on indoor surfaces.
But Jamie believes his brother is being overly cautious in deciding to sit out Great Britain's crucial World Group meeting in Buenos Aires.
He added: "From what I have been reading he hasn't come out and said he's injured, it's more a prevention thing.
"He obviously felt it was more important for him to concentrate on going to Marseille and doing well than coming here.
"From his point of view, I guess he doesn't have anything to apologise for as he's taken the decision not to come.
"If he had come here, he would have caused them problems because he has the ability to win singles matches, he's a world-class player.
"He's been in the top 10 and not by fluke. I think he would have liked to come here and had the crowd against him, he plays better in those circumstances."
Alex Bogdanovic, Jamie Baker and Ross Hutchins complete the British line-up against an Argentina side comprising David Nalbandian, Agustin Calleri, Jose Acasuso and Sebastian Prieto.