Cheltenham defender Harry Hooman, Burnley midfielder Adam Evans and striker Curtis Allan from Northern Irish outfit Coleraine have all agreed deals with Caley Thistle.
It takes the number of new additions to Butcher's squad to seven following the capture of James Vincent, Danny Williams, Ben Greenhalgh and Marley Watkins last week.
The former England captain said: "We have been tracking these lads for some time now, and we are delighted to have landed them in the face of stiff competition from elsewhere.
"It is testament to how far we have moved forward as a club when lads of this quality are willing to make the journey north to join us.
"Our squad for next season is almost complete and we can now look forward to few days off as we will all be back, raring to go, on June 27 and that's not too far away now."
- Sports & Recreation
- Ben Greenhalgh
- Harry Hooman