Northants are looking for a new overseas player after learning Australia bowler Jackson Bird needs to rest his ailing back for four months.
Seamer Bird has been bothered by back trouble for some time and he has no chance of being fit for any part of the six match Championship contract he had signed with the Division One side.
Bird was also left off the list of players centrally contracted by his country, which was released on Monday morning.
A statement on the county's website read: "Obviously this is disappointing news with the start of the cricket season less than two weeks away.
"However the club has been aware of Jackson's potential ongoing injury for some time, having already amended his original contract in order for his workload to be managed more carefully to allow him a pre-season in Australia.
"The club wishes to place on record its hope that Jackson Bird makes a full recovery from his ongoing back injury.
"Over the weekend we have made an offer to another overseas bowler with Test Match experience and we are at advanced stages of hopefully securing a signed contract for that player to join us from the start of the season, for both LV= County Championship and NatWest T20 Blast cricket."