Gordon Murray, the father of Andy and Jamie Murray's father Willie, died last week
Andy Murray will miss his grandfather's funeral on Friday to play for Great Britain in the Davis Cup semi-final against Argentina in Glasgow.
Andy’s paternal grandfather, Gordon Murray, died last week at the age of 83. Andy missed Thursday's press conference, reportedly so he could attend a family gathering, but Jamie was present.
Jamie Murray will only play in the doubles rubber on Saturday and will be able to go to the funeral.
Andy Murray, the world number two, will team up with brother Jamie in Saturday's doubles, with the Scottish duo looking to make the most of the partisan home support against Federico Delbonis and Leonardo Mayer.
Andy Murray will tackle Pella in Sunday's penultimate singles match before Edmund, who reached the fourth round at the US Open, and Del Potro to bring the curtain down.
It means Andy Murray is set to be involved on all three days of the tie, despite the 29-year-old having already admitted to fatigue in a season where he as won both the Wimbledon and Olympic singles titles.
But British Davis Cup captain Leon Smith backed his star player's match day fitness to come to the fore again.
"We saw last year in the semi-final against Australia, you could see Andy was fatigued and he still found a way to do it," said Smith.
"He's a very robust guy, both physically and mentally, so don't be surprised to see him do it."
Del Potro followed his run to the Olympic final by getting to the last eight of the US Open.
As for his upcoming encounter with Andy Murray, Del Potro said Thursday: "I will try to do a different match from Rio. It's going to be really tough but I'm looking forward to do the surprise.
"I will be fresh tomorrow and I know how my level is at this moment. I will try to play aggressive all the time. We'll see if I can give the first point to my team."
(WION with inputs from AFP)