With Adam Jones, Richard Hibbard, Ian Evans and Jones all returning in previous weeks it was the turn of Lions flanker Justin Tipuric to make his first appearance of the season.
But it was the powerful figure of Jones who stood out with a try two minutes from time, although Tandy praised the importance of all of his returning Lions players.
"It is huge to have the Lions back and have another game before we go into the Heineken Cup," he said.
"We need everyone to gel, it was far from perfect against Connacht. Our discipline in the first-half was not good enough and when we have teams on the ropes we let them back into it giving cheap penalties away and that's something we have to look at.
"But I do feel our squad is in a decent place at the minute. We have competition in a lot of areas and we need that."