The Mariners added that is crucial to note that all discussions between the club and Bolt require an initial six-week-trial period and no contract is guaranteed.
Bolt, 31, retired from sprinting past year but has long harboured ambitions of a career in football.
FFA has declined to comment, but it's understood the governing body will not put funds towards a trial under any circumstances.
The Jamaican sprinter has always wanted to move into the world of football, and recently displayed his skills to the world in the Soccer Aid for Unicef friendly.
"Because if he comes and he's not up to the level then it actually has a detrimental effect".
"We don't need it", Hill told SEN Radio.
"FFA is not funding this trial", the spokesman told Fairfax Media. Bolt and Dortmund share an apparel sponsor in Puma.
The Mariners are based in Gosford - about 50 miles north of Sydney - and finished bottom in the A-League last season, recording the longest winless run of 11 games.
Bolt's Mariners team-mates would include All Whites and former Wellington Phoenix midfielder Michael McGlinchey.
"The most important thing is we wait to find out and see how good a footballer he is first", Mr Mielekamp said.
Bolt wasn't offered a contract after respective trials in Norway and Germany. But he's never played soccer professionally.
"He is dead-set serious to be the best he can possibly be".
Bolt is the world record-holder for the 100-metre and 200-metre sprints, but retired from athletics in 2017.
Bolt retired from athletics previous year and still holds the world record for the 100m and 200m sprints.
"I use my speed just like Rashford and Martial".
"It's a trial, no different to Jarryd Hayne in the NFL, or rugby league players becoming boxers or AFL players". Negotiations have been going considerably slower than Bolt did on the track.
"It would only be big if he can play and if he can go really, really well", Mielekamp said.
Bolt has confessed his love for Manchester United and has even been invited to the club's Carrington training complex in the past, while former assistant manager, Mike Phelan, is now the Mariners' sporting director.