The 24-year-old managed just two appearances for the Cottagers after joining from native side Slovan Liberec on a two-year contract last summer.
Gecov's agent, Jiri Mueller, says the once-capped Czech Republic international is hoping to get more regular playing time at Gent.
He told Czech news agency CTK: "The main reason for the change is for Marcel to play more.
"It was not certain if his position at Fulham would improve. At Gent he will be given a better chance and he could come back under the radar.
"Moreover, he will have a better contract there."
Fulham confirmed Gecov's departure on their official website on Monday, saying: "FFC would like to thank Marcel for his efforts during his time in SW6 and wishes him all the best for the future."
The Juventus jersey for the 2013/14 was released earlier this week. Be the first to wear the colors of the Old Lady.
One of the top soccer cleats for control the Nike CTR360 will not let you down on the field in tight spaces.
The new PUMA evoSPEED 1.2 FG. A great new soccer cleat with classic look and first time for PUMA to be on the cleat.
Ajax has released their away soccer jersey for the 2013/14 season. Get in the Gear.
The push for more color on their cleats, adidas has added the infrared colorway to the adiZero f50 Line.
Bayern Munich are kings of Germany and hope to be crowned kings of Europe at Wembley later this month!
adidas has added some color to the Predator line with this new colorway. Released on May 17. Be the first to own a pair.
Borussia Dortmund hears Wembley Calling and are headed to London for the Champions League final.
Chelsea won the Europa League on Wednesday. The Blues defeated Benfica 2-1 on injury time goal from Ivanovic.
The Liverpool 2013/14 soccer jersey is available for pre-order. The Reds are eager to compete for silver next season.