Jacques Nienaber admits Leinster have "lots to work on" if they are to contend with Toulouse in the Investec Champions Cup final.The Blues are into a third straight final after seeing off a late Northampton Saints comeback to win 20-17 at Croke Park on Saturday.They have two rounds of URC games, against Ospreys and Ulster, before the showdown with the five-time European champions in London on 25 May.A James Lowe hat-trick and a masterclass from scrum-half Jamison Gibson-Park had the hosts 20-3 in front with 22 minutes to play.From there, the English league leaders scored two converted tries and fell just short of an astonishing comeback."The whole world will know we were in control for 60 minutes," former Springboks head coach Nienaber told RTÉ Sport."We had good control of the game and then obviously with the quality of opposition that we had, you can see why they are the top Premiership team currently; they kept coming at us and we had to finish out the game in the last eight minutes or so."Some of it, we did really well, some of it we could have done better.
That's probably the take-home."From our view there is lots to work on going into the final. But we’re not thinking about the final just yet."I said to the lads that if we lift our heads up too high and start looking at the horizon we might fall over the obstacle right in front of your face."Ross Byrne, who kicked five points, missed three off the tee with a penalty in the 63rd minute and Nienaber said closing out games is about being ruthless when the chances arrive."I think it boils down to execution, you must take the opportunities that you create.