Current paddock rumours are that Dennis will leave his post at the end of the season, however nothing has yet materialized.
"I only have the utmost respect of Ron," Horner said. We've gone head-to-head and fought over sponsors, engineers, drivers, whatever, but he's always played fair.
"It would be a great loss if he's not involved, certainly for McLaren and also Formula 1. What he has achieved in Formula 1 is quite remarkable," added Horner. "What he has built McLaren into is an example to us all.
"He's a passionate man and he argues for the right things for Formula 1, sometimes to the detriment of his own team."
Bahrain International Circuit - Winter testing