The club confirmed on Saturday that both players had signed one-year contracts and been registered in time to play in their Europa League opener against Malmo in Sweden on Thursday.
Former Rangers midfielder Thomson returned to his boyhood club in March to play for free after being released by Middlesbrough and has been rewarded with a contract.
The 28-year-old, who was with Hibs on their pre-season camp in Spain, told the club's official website: "I'm really pleased to have agreed a deal - I always wanted to stay here.
"There were other offers on the table from clubs down south, but I knocked them back because I had my mind set on staying with Hibs.
"I'm aiming to get back to my best and to play consistently well for Hibs.
"We've got a good group of boys here and I want to play my part in helping to drive the club forward."
- Sports & Recreation