Mackay, who used to work for Rangers, says he can get the England forward back playing in as little as four months.
The Daily Mail says Mackay predicts that by using an internal brace, Walcott could run again in as little as 12 weeks.
The procedure would involve a device being inserted into Walcott’s knee, which Mackay says would instantly stabilise the joint and allow the forward to begin his rehabilitation sooner. This would allow the ruptured ligament to re-attach itself naturally to the bone and Walcott could progressively increase his workload.
Walcott is due to have surgery in the next two weeks to repair the damage.
Mackay, who has helped numerous sportspeople with this alternative technique, will contact Arsenal on Wednesday.
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball