McKenzie is a striker who signed for Maidenhead in the summer from Romford, where he had scored 21 times in last season's Ryman Division One North.
Following the Magpies excellent start to their first season in the National League's top division he has found it difficult to force his way into their starting eleven, although he has already appeared from the bench.
It is expected that McKenzie will be available for the Rocks at Chelmsford City tomorrow.