Yorkshire have signed New Zealand Test batsman Kane Williamson for the last five games of the County Championship season.
Yorkshire are top of Division One and are bidding for an unlikely title triumph in their 150th anniversary year, having only been promoted to the top flight last season.
International call-ups have taken their toll, with Joe Root, Jonny Bairstow and Tim Bresnan on England duty, and Gary Ballance, the mainstay of their middle order this season, has been called up by the Lions.
Aussie import Phil Jacques is out injured so the Tykes needed to bolster their batting options and have done so with Williamson.
Head coach Jason Gillespie said: "We have moved swiftly to strengthen the side going into the final five matches of the season. Once we knew that Gary was unavailable, because of his international call-up, we made a conscious effort to bring in a proven international batsman to help bolster the squad.
"It is the right thing to do and he is a quality player with a proven first-class record. It is imperative that we give ourselves every chance of bolstering the squad for the final run-in.
"Kane will be with us until the end of the season and will be available for selection in our five remaining Championship fixtures."
Williamson averages 31.47 in his 25 Tests, with three hundreds and eight fifties, and 40.40 in first-class cricket.
He is no stranger to county cricket, having played 17 Championship games for Gloucestershire in 2011 and 2012, averaging 39.90 with three hundreds and six fities.
He said: "Once I knew Yorkshire were in for me, I jumped at the chance of being part of their plans in the final part of season.
"It is a club steeped in history and with some important cricket still to be played this season, I hope I can make a difference and help Yorkshire realise its dream of winning the Championship crown in its 150th anniversary year.
"Outside the international arena, the County Championship is regarded as a tough uncompromising competition. To play for Yorkshire will enhance my game and give me every opportunity to score some runs as I get ready for the summer back home in New Zealand."