Sexton, who already has three Heineken Cup winners' medals on his mantlepiece, now has his sights firmly fixed on a fourth European title. Leinster meet reigning Amlin champions Biarritz Olympique at the RDS on Saturday, 27 April (kick-off 2.30-m) and will have home advantage once again in the final if they progress through.
Sexton's injury - he suffered a hamstring strain earlier in the 6 Nations as well - allowed clubmate Ian Madigan to win his first full cap in Rome and the young outside half stand-in has been outstanding while Sexton has been on the sidelines.
Madigan helped himself to 28 points in the quarter-final win over London Wasps at Adam Park and has scored 219 points in 27 outings so far this season. He has scored 121 points in the eight games since Sexton last played at an average of 15 points per game.
Leinster also hope to have Fergus McFadden back in harness for the game against Zebre on Sunday and veteran centre Gordon D'Arcy, who suffered a slight calf strain during the win over Munster last weekend, looks set to travel and play.
More than 16,000 tickets have already been sold for the RDS semi-final showdown with Biarritz.