Scotland forwards Kelly Brown and Jim Hamilton remain doubtful for the World Cup Pool B decider against England.
Number eight Brown is being treated for concussion after coming off against Argentina following a blow to the head.
And second row Hamilton sat out training with a knee problem picked up in the 13-12 defeat.
Scotland defence coach Graham Steadman said: "Kelly Brown's making good progress, as is Jim Hamilton with a slight knee problem."
Richie Gray also picked up a hamstring injury in the defeat by the South Americans but the lock has returned to training.
Steadman suggested Brown and Hamilton were the only question marks as coach Andy Robinson prepares to announce his team.
"Apart from that, everybody else trained well and we had a good session," he said.
The Scottish camp is hopeful all three forwards will be ready to face England in their final group game in Auckland on Saturday.
Robinson's side must beat England by eight points or more - thus denying their opponents a losing bonus point - to be certain of advancing to the quarter-finals.
The head coach must decide whether to stick with Rory Lawson at scrum-half ahead of Mike Blair and Chris Cusiter.
With Gray nursing that injury, tournament captain Alastair Kellock, who was omitted from the matchday 22 against Argentina, could return in the second row.
Euan Murray is likely to return at tight-head prop after missing the Pumas fixture as it fell on a Sunday, thus conflicting with his religious beliefs.
There are other decisions behind the scrum for Robinson to make - whether to keep Ruaridh Jackson in at fly-half ahead of the experienced Dan Parks and whether to bring in Joe Ansbro or Sean Lamont for Nick De Luca at centre chief among them.