Nothing released that I've seen but looking at the way he pulled up it's extremely unlikely imo we'll be seeing him back before Madrid at the earliest.
Those Hammie tweaks even when minor take a while to clear up and are liable to go again but to a worse extent if you rush them. Did mine back in January and while it wasn't too bad (was walking, even jogging and getting about my day to day stuff with no issues) it was still 3 weeks rest and 2 weeks of physio/rehab before the physio would clear me for cycling or rowing.
Aké is younger and no doubt fitter than I am with access to better care but he's got a higher bar of intensity to clear as well.