Although both have intercostal strains, Collins said, Murphy's is more ominous.
"I don't know about Murph, but after my conversation with David, I'm certainly counting on having David for the season," Collins said. "Dan, I'm not sure yet. ... They're both different injuries. They may be similar in where they are, in location, but one is not as severe as the other."
In the event both were to land on the disabled list to open the season, Collins indicated Jordany Valdespin should start at second base and Justin Turner at third base. If there were only one infield vacancy (Wright active, Murphy DL'd), Turner probably would start in the infield -- with Collins looking to insert Valdespin's bat in the outfield instead.
"Right now, the way he's played down here, you have to figure out how you can get his bat in the lineup," Collins said about Valdespin. "If David's ready and Turner's playing second, you've got to figure out where else you can play him."
Collins expressed confidence Turner (sprained right ankle) would be in a game on Friday.
"He'd probably be the guy I lean to, because he's done it," Collins said about Turner being the first person to plug an infield void. "He's done it at this level and he's done it successfully. But, again, it all depends how his ankle responds. ... The trainers have pretty much assured me he'll be in by the weekend."