Kettering have registered midfielder Stefan Bailey and striker Keiron St Aimie on non-contract terms.
Meanwhile right-back Luke O'Neill has extended his loan spell from Leicester until the end of the season.
Former QPR man Bailey, 23, has spent the season at AFC Telford while St Aimie, 21, also an ex-Rangers youth, last featured for AFC Hornchurch.
"He asked to train with us to see where it takes him," Poppies boss Marcus Law told BBC Radio Northampton of Bailey.
"He got injured during the season and hasn't been able to break back into Telford's side.
"I told him the remit of the club and there's certainly no financial reward for him but he's keen to show his capabilities and impress myself with hopefully a view for next season."
Striker Callum Wilson, on loan from Coventry, will return to the Ricoh Arena after Kettering's upcoming games against York City and Luton Town.