The 2. Bindesliga side were highly favored to snare the 23-year-old Socceroos striker - but their continued slide into a relegation dog-fight has cast a shadow on their quest to bring the now ex-Brisbane Roar revelation to the Fritz-Walter Stadion.
Kaiserslautern are just two points off being sucked into a relegation play-off going into this weekend's final round, and should they ultimately go down then all bets would be off.
The Germans have an agreement to sign Maclaren's Roar teammate Brandon Borrello, which could also potentially collapse if they drop to the third tier.
Maclaren, who is weighing offers elsewhere in Germany as well as Belgium and Holland, is now a free-agent after departing Suncorp Stadium with 39 goals from 54 appearances tucked in his CV.
His agent, Sydney-based Paddy Dominguez, has departed for Europe for meetings with club officials, with the aim of finalising where Maclaren, 23, will be playing his football next season.
His next destination will be a strategic move, aimed at priming him for a jump into one of the top divisions in one of Europe's leading leagues within 18 months.
"I will be talking to several clubs with the aim of coming to an agreement, but there is no deadline in my mind," said Dominguez, who will be in Germany, Holland and Belgium.
"Jamie is a free agent and it's all about finding the right fit for him ... there is no need to be rushed.
"If it happens now, then great, if not then no problem.
"We are talking to people in Holland, Germany and Belgium ... it will be one of those three countries for sure.
"There's been a huge amount of interest, and it's now a matter of following it up to see if we can reach an agreement."
Maclaren has already passed up on rich offers from across Asia and also the English Championship as he seeks a club and competition best suited to his style and nurturing his continued development.