The Philadelphia Phillies had reached an agreement to acquire veteran Tyler Anderson from the Pittsburgh Pirates. However, the deal has a problem, according to CBS Sports.

The nature of the holdup is due to an issue with one of the minor leaguers heading to Pittsburgh in the deal, according to Ken Rosenthal of The Athletic. Anderson threw a bullpen session at PNC Park on Tuesday afternoon, reports Jason Mackey of the Pittsburgh Post-Gazette. It’s unclear whether the Phillies can still complete the trade (perhaps with different prospects) or whether Pittsburgh will look to trade Anderson elsewhere.

Anderson, 31, is on a one-year contract and owed the balance of a $2.5 million salary for 2021. On the season, he’s pitched to a 4.35 ERA with 86 strikeouts and 25 walks in 18 starts and 103 1/3 innings. 

His ERA is skewed in the wrong direction by a disastrous nine-run outing against the Braves in late May, so he may project a bit better than you might think over the balance of the season. Anderson was scratched from his scheduled start on Tuesday, signaling a deal was close.

The Phillies, who enter Tuesday’s slate with a 50-49 record and 3 1/2 games behind the first-place Mets in the NL East, have struggled to get reliable starting pitching behind Zack Wheeler. If the deal goes through, then Anderson figures to slot in behind Wheeler and Aaron Nola in the Philly rotation.