Updated

Chicago, IL (SportsNetwork.com) - The Chicago White Sox have reportedly solidified the back end of their bullpen by signing closer David Robertson to a four-year contract on Monday.

USA Today is reporting that Robertson will make in excess of $40 million over the length of his contract.

The Chicago Tribune also reported the club is close to trading for starting right-hander Jeff Samardzija, who pitched to a 2.99 ERA over 33 starts with the Cubs and Athletics last season.

The Tribune did not reveal what the Sox would send Oakland in the proposed deal.

The 29-year-old Robertson is coming off a 2014 campaign where he registered 39 saves and struck out 96 batters over 64 1/3 innings for the New York Yankees. He also compiled a 4-5 record with a 3.08 earned run average.

Robertson has gone 25-19 with a 2.81 ERA and 47 saves in 402 appearances over seven seasons with New York.