White scored a hundred on his Championship debut for Somerset
Australian international all-rounder Cameron White is to return to Somerset in 2010 to play Twenty20 cricket.
The 26-year-old first played at the County Ground in 2006 scoring almost 1,200 first-class runs.
The following year White topped the Somerset batting averages with 72 after making 1,083.
Somerset director of cricket Brian Rose told BBC Radio Bristol: "With his status as one of the world's best one day players it's an exciting prospect."
Rose continued: "He may only be able to make some limited appearances because of his commitments to Australia.
"We think he can play in the first six or seven games and certainly from the quarter-finals to the finals if we get that far."
Since his first spell at the County Ground White's stock as an international limited-overs specialist has risen.
He has played 47 one-day matches for Australia averaging almost 33 with the bat and eight Twenty20 internationals at 41.40.
"I think the Somerset cricketing public remember Cameron playing some fantastic innings in one-day cricket.
"But he also played some of the best first-class knocks I've ever seen," added Rose.
With his status as one of the best one day players in the world, it's an exciting prospect
Due to a change in the rules in the Twenty20 competition each county can now play two overseas players in each game.
And White joins Indian spinner Murali Kartik to significantly boost Somerset's one-day squad.
Former Middlesex batsmen Nic Compton has also arrived at Taunton during the winter and Rose says there may be more signings.
"We're still hoping to get cover in the early part of the season as Murali Kartik is involved in the Indian Premier League," said Rose.
"He's not available until the middle of May so we may still get someone in for the first four Championship games."