Frankie had already sent his medical records to the UFC before any of that went down. They knew he had surgery.
http://www.mmamania.com/2016/2/24/1...it-comments-refusing-conor-mcgregor-fight-mma
"I didn’t just pull my groin, I tore it. I sent Dana and everyone in the UFC my MRI. I’m even more pissed that Dana’s insinuating that I ‘refused’ to take this fight, which is bullshit, just because they asked me doesn’t mean they were going to give it to me because guess what, in July they asked me to take the [UFC 189] fight on 15 day’s notice, which of course I accepted, and I still didn’t get it. I feel like my integrity is something that I’ve built over the years and I’ve been such a good guy to the UFC, and then they’re going to throw me under the bus like I ‘refused’ to take this fight. I have a feeling that if I had said ‘yes,’ if Ali had texted back ‘yes,’ that fight still would have went to Nate Diaz. I think Nate Diaz was the fight they were trying to make since the beginning. Why didn’t they go with Cowboy? Cowboy was fresh off a camp. He’s in shape, no injuries. They decide to go with a guy like Nate who can’t even make 155, so how much training has he been doing? I don’t understand why they picked the guy who’s probably not ready for the fight. Why not pick a guy like Cowboy who seems to be ready for it? It sounds fishy to me."