However, Nijland indicated that Groningen were prepared to negotiate a fee for the 30-year-old, who has hit 53 goals in 116 appearances and signed a three-year contract extension in April.
"The London club on Tuesday made their first offer," Nijland said. "We could not agree with their offer and now have to see what their reaction is.
"We are speaking about all this with Erik and up until now we are on the same wavelength.
"Erik also understood that we found the fee that Fulham offered us did not meet out valuation."
"We cannot hide from reality," Jans said on Tuesday. "I'm convinced that Fulham will contact us today and we have to wait and see.
"Fulham seems a reasonable club and they have made a good bid for Erik to pay off his long-term contract.
"Maybe the match against NEC will be his last for my green and white army. On the other hand, I know Erik well enough to know that if the transfer does not happen, he will commit himself 100% to FC Groningen."