The 20-year-old hasn't featured for England since impressing on the pitch during the World Cup as a shattered eye socket and a hamstring injury has ruled him out up until now.
But Tuilagi has just played back-to-back games for the Tigers and stood out in their 20-19 win over Saracens on Sunday leaving Lancaster to choose between him or Brad Barritt alongside Owen Farrell.
Add to that similar returns from fly-half Toby Flood and lock Courtney Lawes and Lancaster's job becomes even tougher - not that he is shirking the task.
"Having that group of players back has given me something to think about. From our point of view it's a great position to be in to have competition for places," said Lancaster.
"We go in to this match on the back of two wins and we have had a lot of competition in training. In terms of Manu he has had such limited games time since the World Cup.
"So it was a good chance for him to get another 80 minutes under his belt. At that level, in that quality of a game, it was just a great opportunity for him to play another game.
"We were pleased for him and how he played. He did a lot of things well and I am pleased with the way that it went."