Garmin confirm Dekker and Rasmussen
Both riders were last-minute additions to the team's line-up and both have been associated with doping scandals.
Dekker served a two-year suspension after admitting doping while Rasmussen failed to accurately report his whereabouts to the anti-doping authorities on three separate occasions.
Team boss Jonathan Vaughters remains convinced his new signings are entirely clean.
Of Dekker Vaughters said: "We've done 18 months of testing on him to determine this.
"That included power tests every month and corresponding blood tests. His power should go up as his training increases, but his blood values shouldn't.
"That's exactly what happened, and his last tests when he won Duo Normand were world class."
Rasmussen was facing a ban from the Danish federation, but his case was dismissed, leaving him free to ride with Garmin.
"It wasn't even guilty or not guilty, they dismissed it. He has a perfectly valid contract and will be racing with us next year," Vaughters said.