Adam Wainwright injured: Who might replace him in Cardinals' rotation?

In case you missed it, Adam Wainwright was injured tonight trying to get out of the batter's box on a popup of all things.  He will undergo an MRI to see the extent of the injury, but its likely he's headed to the DL.

Its uncertain how long he will be out, with some speculating that, if he has a torn Achilles, he could miss the rest of the season.  However, that is the worst case scenario.

At a minimum, he will probably miss at least one start, leading to the question of who will replace him in the starting rotation?  Here are the Cardinals' options:

Marco Gonzales

The first and most logical choice is Marco Gonzales.  He pitched well during the spring, losing out in the 5th starter race to Carlos Martinez, despite going 3-0 with a 1.04 ERA.

As an added bonus, he is already on the 40-man roster, so calling him up would not cause the Cards any roster management headaches.

The only problem with Gonzo is that he has not pitched too well in the early going at AAA, with a 4.50 ERA in 3 starts.

Tim Cooney

Cooney has fared the best of any of the AAA starters, with a 3.63 ERA in 3 starts.  His stuff is reminiscent of Gonzales, relying on his changeup and control, instead of trying to overpower hitters.  However, he is not as far along as Gonzales and the Cards may want to give him more time to develop.

Add in the fact that he is not on the 40-man roster and its unlikely that he gets the call.

Tyler Lyons

Yet another lefty, like Gonzales and Cooney, Lyons has made 12 starts for the Cardinals over the last two years, serving mostly as a stopgap until someone better was ready to take over.

He could serve the same function this year, if the Cards feel that the need to give Gonzales more time to get into a groove or if they think Wainwright will only miss a minimal amount of time.

He is also on the 40-man roster, which is an added bonus.

UPDATE:

It appears that the Wainwright is going to miss the rest of the year with an Achilles injury, so Gonzales is the likely choice to fill in.  However, Gonzales is currently dealing with a shoulder/pectoral muscle injury, so Lyons will likely get the call in the short term.

Of course, they could always trade for Cole Hamels, but that is a story for another day....