The 20-year-old USA international impressed Hoops boss Neil Lennon while on trial at the club in November.
That stint has prompted the Scottish Premier League club to make a bid for the youngster, who has also spent time on trial at West Ham.
Sanchez claims the offer is too low to raise their interest but says Agudelo could still leave in the near future, with a year left on his contract.
He told the Daily Record: "My sporting director has told me the offer from Celtic is not a serious one.
"But he could still leave in six months as we don't own his transfer rights."