While an official announcement isn’t expected to come until Saturday afternoon, Ken Rosenthal of FOX Sports writes that the Yankees are on the verge of acquiring first baseman Lance Berkman from the Astros. (Joel Sherman of the New York Post posted the same report on his Twitter page.)

With Mark Teixeira entrenched at first base, Berkman would become the Yankees’ new DH for the stretch run. He would still have 24 hours to cancel any deal because he has a full no-trade clause in his contract, but one would assume that he would waive it in order to join a contender for the final two months of the season.

It’s unclear at this point what the Yankees would have to give up in a deal for Berkman, although prospects David Adams and Ivan Nova have each been mentioned in other trade scenarios. (Adams’ name was mentioned in the Cliff Lee deal before talks with the Mariners broke down.)

One interesting thing to note is that Alyson Footer, who is the Astros’ Sr. Director of Social Media, writes via Twitter that Berkman does not want the new team to pick up his $15 million option for 2011. It would appear as though he wants to return to the Astros next season.

Update: Sherman now says the deal is completed – Berkman is a Yankee.