The talented youngster is unhappy with his lack of playing time at the Giuseppe Meazza outfit, and could be on the move in the upcoming transfer window
The striker joined Inter form Feyenoord at the start of the season, but has been struggling to secure regular first-team action at the Serie A giants so far.
Therefore, Castaignos is considering his options and he's ready to leave the Nerazzurri on a one-year loan deal, or on a permanent basis.
"Inter said that they wanted to rejuvenate their team when they signed Luc, but the average age is over 30 now. I think that a loan move is the most realistic option, or perhaps a big club will be willing to take him on a permanent move," Treffers told NUsport.
"Next season will be crucial for Luc. He wants regular first-team football, and that seems to be difficult at Inter. We'll see what happens, but there's plenty of interest."
Castaignos has netted once in only six Serie A appearances this term.