Parramatta offered Santi a competitive deal which would see him included in the top 25 squad. An offer which Wests Tigers were not in a position to match.
Santi is a second-row, lock who has been described as a "work horse" which lead him to captaining the Australian Schoolboys in 2011.
Mayer said he and Wests Tigers attempted to secure Santi, however they were unsuccessful. Mayer saying, "We tried. I wish the young man the best."