During the 1984 season, Giesler played on the best pass-blocking line in the NFL, and Dolphins' coach Don Shula rated Giesler as "his steadiest offensive lineman." In 1986, Giesler missed the first six games of the season after undergoing knee surgery and then injured the knee again late in the season, limiting his playing time to a career-low seven games during the 1986 NFL season. Giesler considered retiring prior to the 1988 season and conducted a two-month holdout before signing a two-year contract with the Dolphins for a reported $657,500.
During the 1984 season, Giesler played on the most effective pass-blocking unit in the NFL, and Dolphins' coach Don Shula viewed Giesler as "his most dependable offensive lineman." In 1986, Giesler was sidelined for the first six games of the season after undergoing knee surgery and then suffered another knee injury late in the season, limiting his playing time to a career-low seven games during the 1986 NFL season. Before the 1988 season, Giesler considered retiring and held out for two months before agreeing to a two-year contract with the Dolphins worth $657,500.