Castro said he won't change his approach to blocking the plate, which errs on the side of caution.
"I show that they have a little bit of the plate. I give them something and then try to take it away and apply the tag at the last second," Castro said. "[Gamel] had already made up his mind that's what he was going to do. Luckily I had time to brace myself."
Castro said he treated his neck and head with over-the-counter medication and ice. He took batting practice on Friday and gave Astros manager Brad Mills a positive report afterwards.
"I spoke with him in the outfield and he said he felt great, no issues at all," Mills said. "He's 100-percent ready to go. It's really nice to see."
Castro is batting .244 in 12 games, but he's 7-for-16 (.438) with three RBIs in his last four contests.