Don't get me wrong, he played on the left too last season. But most of his games where on the right, that is for sure. At the start of the season the front three looked like this
Lisandro----Gomis----Bastos
Gomis didn't do so well, so after a while Lisandro was shifted to the center and Delgado was put on the left. All the while Bastos and Govou were being rotated together. Puel does a fair bit of rotation though, so Bastos got some games on the left too. But the left was occupied first by Lisandro then by Delgado. So in most cases Bastos was playing on the right.
For further proof, forget the Ligue, look at Lyons setup in the CL. If you watched the game against Liverpool, Bastos was played on the right, you can check out the highlights, he had quite an interesting battle with Insua, Lisandro was played on the left in that game. Against Fiorentina it was the same, Lisandro on the left and Bastos on the right. Against Real he didn't play, against Bayern, Delgado was on the left and Bastos was on the right, against Bordeaux it was the same story.
So actually even in the CL, Bastos never, not even once(I'm not sure about the Debrecni game, i cannot recall that one) started a game on the left.