Carruthers, 23 has penned a three and a half year deal on for an undisclosed fee according to Official site sufc.co.uk.
“We have tracked and monitored Samir for some time and he is a player who can grow with us, we are delighted that the Board have backed us with this level of investment.
Chris Wilder told sufc.co.uk; “Samir is the right age, has a great pedigree from his time at Villa and MK and he is an exciting player. He is an attacking midfielder who can fit into a number of positions and we are looking forward to introducing him to our great group.”
He is likely to be involved in this Saturday's trip to Southend United.