England pair Haseeb Hameed and Ben Duckett are named in the MCC team for March's Champion County game against Middlesex.
Middlesex pace bowler Tom Helm signs a new contract which will keep him at Lord's until the end of the 2019 season.
Division Two side Northants sign England Under-19 captain Max Holden on loan from Middlesex until the end of June.
Australia batsman Adam Voges is to return to county champions Middlesex in 2017 for his fourth spell with the club.
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How to get into cricket - physical exertion with a chess-like element in matches which range from half an hour to five days.