Claros, 26, signed a 12-month loan deal from Motagua on the final day of the January transfer window, but had to travel back to his homeland to await clearance to play for Hibs.
Pat Fenlon will now assess the midfielder's sharpness ahead of the SPL clash against the Dons at Easter Road following return to Scotland.
Fenlon told HibernianTV: "He has trained this morning, all his paperwork is through. He's available for selection.
"We'll see how he is tomorrow because he has done a bit of travelling over the last few days. But he is available to play."
Hibs followed up a busy transfer window with a 1-0 Scottish Cup win over Kilmarnock, but their new-look back four will be broken up by suspensions to Paul Hanlon and James McPake.
However, Fenlon is looking for the same commitment from whoever comes in.
"I think last week showed what we want from defenders," Fenlon said. "It set a benchmark - if you want to be in the team, that's how you have to perform as a defender.
"Players will either take that on board and grasp that or shy away from it.
"We'll find out over the weekend who is good enough to step up to the plate."
On-loan Stoke midfielder Tom Soares is set to miss the Aberdeen visit along with the suspended Leigh Griffiths and still-absent Ian Murray and Danny Galbraith.
"Danny is still struggling with his groin and Tom Soares has picked up a little bit of a hamstring strain," Fenlon said. "He will struggle for Saturday."




















