The midfielder was released by Iain Dowie at the end of last season and has teamed up with former Sky Blues Darren Currie and Paul Furlong in a bid to earn a contract.
Luton Boss Kevin Blackwell said: 'Don is here training with us and we're having a look at whether we can do anything with him."
Last night,Craig Reid played for thirty minutes for Cheltenham Town in a 4-0 win at Bath City. The former City Reserve team striker was involved in two of the goals.