"It's a fantastic achievement, and it certainly gives us a boost. It can only have a positive knock-on effect for us. You never seem to feel tired when you are winning," explained Jenkins.
The former Wales fly half paid tribute to Shane Williams and Martyn Williams who will both be winding down their remarkable careers at the Millennium Stadium.
"They are both amazing players," he said. "Martyn deserves his 100 caps, which is probably the minimum he deserves. He has been an outstanding player for Wales, the Lions, Pontypridd, Cardiff - he has pretty much done everything.
"And Shane just writes script after script. I hope he doesn't score on Saturday, although I am sure he will be there or thereabouts!
"Both of them are legends of the game, and we should be very proud of them and what they have achieved. I think Saturday is going to be a pretty tough game.
"Even though the Barbarians play off-the-cuff rugby and it is very difficult to prepare for, we have to focus on ourselves and make sure we are ready.
"I played for the Barbarians, and while they maybe don't take it too seriously in the week, as game time gets closer you want to back yourself.
"You back your own skills, and they will be ready to rock, come game time on Saturday."