"Other contributing factors include the volcanic ash cloud and current economic climate affecting both airline and traveller decisions, " he said.
Fulham arrived in Hamburg by plane on Tuesday after airspace reopened following disruption caused by the volcanic ash cloud from Iceland.
Ryanair said its 90-minute flight at 41, 000ft showed there was "no visible volcanic ash cloud or evidence of ash on the airframe, wings or engines".
The Reds were forced to abandon plans to fly direct to Spain as a result of the volcanic ash cloud that has caused travel chaos across northern Europe.
The planned modifications to both cars were delayed due to the volcanic ash cloud that left the teams stranded in Shanghai for days after the Chinese Grand Prix last month.
It started 10 months ago and has taken in 18 matches and nearly 20, 000 miles of travel, including a lengthy trip by coach to Hamburg for the semi-final first leg when the volcanic ash cloud crisis grounded flights in Europe.
And with Saturday's defeat by Mainz ending Hamburg's 12-game unbeaten home record, Fulham will arrive in high spirits - despite the arduous 600-mile drive they were forced to take because of the closure of British airspace after the volcanic ash cloud.
England, one of eight teams yet to travel to the Caribbean for the 12-team tournament, could have flown from Dubai, if their scheduled flight from London had remained grounded because of the volcanic ash cloud produced by an eruption in Iceland.
But the no-fly zone still applied to most of Britain, and a new cloud of volcanic ash was reported to be on its way.
Liverpool's game at Atletico Madrid and Fulham's trip to Hamburg had been in doubt due to the cloud of volcanic ash from Iceland that has grounded flights.
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