The striker damaged ankle ligaments on international duty a fortnight ago - so far forcing him out of our games against Leeds, Liverpool and Fulham and Irish action this week.
Glenn Hoddle reported last week that the news on the injury was encouraging and Robbie backed that up on Monday.
"The ankle is not too bad," he insisted at Spurs Lodge. "It's coming along a lot quicker than expected so hopefully I'll back in the next couple of weeks."
But Robbie will sit it out as his Irish team-mates, including our own Steve Carr and Gary Doherty, take on the Russians in Euro 2004 qualifying Group 10 at Lansdowne Road.
Victory will put Ireland six points clear of Russia and a point ahead of current leaders Switzerland - Russia, who will only have two games left, then play Switzerland next Wednesday. Ireland will have one game left - it could be a group decider at Switzerland.
"I'm disappointed to miss out because I don't want to miss any game," he added.
"This is a crucial game for us but I'm sure the lads will do us proud. I'm gutted but injuries happen in football and I'll be cheering them on whatever."
Robbie Keane is confident of returning to action before too long - but admits he's 'gutted' to miss out on Ireland's crucial Euro 2004 qualifier against Russia on Saturday.