Chris Copeland appears on the way out and Pablo Prigioni on the way back. Things were heating up on the Copeland hunt yesterday as he was on the verge of signing an offer sheet that would likely spell the end of his brief but entertaining Knick career. According to sources, Copeland has three offer sheets to choose from — the Pacers, the Lakers and an unknown team, possibly Cleveland. As The Post reported, Mike D’Antoni was the first to call Copeland’s agent, John Spencer, when free agency began. The Knicks have already offered a portion of their $3.18 mini mid-level exception to Prigioni. According to a person close to Prigioni, he received a two-year deal in the $2.3 million range. That would be $1.15 million of the exception and would likely not leave enough to match Copeland’s offer sheet. “The Knicks loved Pablo,’’ one person familiar with their thinking said. The Pacers, who eliminated the Knicks in six games, were looking to sign Copeland to an offer sheet with a portion of their mid-level exception of $5 million. The Knicks would technically have three days to match, but wouldn’t be able to under new collective bargaining agreement rules.