England has delayed a decision on Matt Stevens' fitness for the Calcutta Cup clash against Scotland until today.
The Bath prop suffered a sprained right shoulder during his club's Guinness Premiership defeat against London Irish two days ago.
If, as looks likely, Stevens is ruled out of next Saturday's appointment with Scotland in Edinburgh, then Leicester tighthead Julian White would be favourite to replace him.
While Stevens continues his fitness fight, Robinson is optimistic that Wasps' backs Tom Voyce and Josh Lewsey will both be available for selection.
Voyce, who started at fullback instead of shoulder injury victim Lewsey against Italy in Rome nine days ago, lost teeth during Wasps' 9-9 Premiership draw with Bristol yesterday.
If both players are fit, then Lewsey would be favourite to return in the No 15 shirt, with Voyce dropping to the bench.
Elsewhere, Robinson has called up uncapped Northampton centre Jon Clarke to his squad instead of Wasps' Stuart Abbott.
Abbott limped off after just 11 minutes at Bristol on Sunday suffering from bruising to his leg, and he will remain with his club this week.
Clarke performed well for England A when they defeated their Italian counterparts two weeks ago.