Australian Adam Voges will continue as Nottinghamshire's overseas player until after his side's FL t20 quarter-final.
Notts had originally secured the services of David Hussey but his international call-up means he will not be available until later in the season.
Voges is now also set to play in Championship games against Somerset, Hampshire, Lancashire and Durham.
"I think it is important he stays with us as long as we can keep him," said Notts director of cricket Mick Newell.
"Adam is going to stay for a least two or three more weeks, so he will definitely be available for Somerset.
"I am hoping Adam stays as long as possible and, who knows, maybe Tamim [Iqbal] will come back later on."
Voges has taken over the Twenty20 captaincy from Hussey and helped lead Notts into the quarter-finals on Tuesday with victory over Worcestershire at New Road.
Voges added: "We are sitting mid-table in Championship cricket at the moment and that's obviously not where we want to be.
"We have got tough games coming up in the next three weeks. I am pretty happy to be staying around and making sure I contribute for those games.
"I love playing for Notts and I was always coming back for (T20) quarter-finals."