Scotland captain Chris Cusiter has all but ruled himself out of the first Test against Argentina.
Scrum-half Cusiter is struggling with the knee injury which forced him to miss the 24-5 win over a makeshift Japan side at Murrayfield on Tuesday. Andy Robinson's Scotland face the Pumas in Tucuman before the second meeting in Mar del Plata a week later.
"To be honest I'll probably be ready for Mar del Plata. I didn't train fully last week and I probably won't train fully this week until Thursday or Friday so it's too late for the first Test," Cusiter said.
"The injury is improving, slightly, but improving. I have to keep working hard with the medics."
Argentina beat Scotland 9-5 in Edinburgh in their last meeting and Cusiter is aware of their strengths.
"They have a strong pack and a number of world class scrummaggers and their line-out is very good," he added.
"We struggled last November to get line-outs.
"That time, we didn't take the opportunities. They were very tenacious and then in the second half they played better than us.
"We had opportunities earlier in the game to get a couple of tries on the scoreboard but we didn't take them because they were well organised and their defence is very good.
"They know their game plan and execute it very well. They are a very tough team to beat but we hope to win both Tests."