The Dutch striker is set to miss the remainder of the MLS season after sustaining cruciate ligament damage in his knee on the weekend and now Mariner has his fingers crossed that he can find a player who can pick up the flack after the ex-PSV attacker scored nine of the teams 22 goals before his injury.
"We've got to be looking at the forward position. We're a little thin," Mariner told reporters.
"Somebody else will step in and somebody else will do a great job. So, no real worries but obviously behind the scenes we're looking to try and fill holes.
"We're trying to do some things but decent strikers don't grow on trees in world football, never mind in MLS so let's see what happens."
He added: "Obviously no one's going to fill Danny's shoes. He's a great player and it's a huge loss for us. But at the same time it opens up another spot for guys to step in and hopefully take advantage of the opportunity."