Guenther Steiner has insisted Haas is abiding by all the necessary regulations surrounding its relationship with Ferrari.
The American-owned outfit has had close ties with the Scuderia since starting in F1, with the relationship seeing Mick Schumacher placed at the team as part of Ferrari's Driver Academy.
The ties have now allowed for a design office at Maranello to work in conjunction with the bases in Kannapolis, North Carolina and Banbury.
Haas was also boosted by an influx of staff from Ferrari at the introduction of the cost cap as the Italian team sought to cut down its workforce to meet the restrictions, with Simone Resta the most striking name to join Haas as technical director.
Explaining the situation, Steiner said: “They are seconded to us.
"The FIA is aware that they need to be completely detached from Ferrari but obviously, employment laws in Italy are applied to this and we are following them and we are following also the FIA rules.
“When people move over there is a period that they cannot work and things like this.
"So it is all regulated, everybody is aware of it, but people have got personal agreements with Ferrari and we cannot disclose them obviously, as much as we would like to explain everything, but they are private and therefore I cannot say.
“But some people are Ferrari employees and some people are not.”