Reginald Martinez Jackson (born May 18, 1946) is an American former professional baseball right fielder who played 21 seasons for the Kansas City / Oakland Athletics, Baltimore Orioles, New York Yankees, and California Angels of Major League Baseball (MLB). Jackson was inducted into the National Baseball Hall of Fame in 1993. Jackson was nicknamed "Mr. October" for his clutch hitting in the postseason with the Athletics and the Yankees. He helped Oakland win five consecutive American League West divisional pennants, three consecutive American League pennants and three consecutive World Series titles, from 1971 to 1975.

In 1980, Jackson batted .300 for the only time in his career, and his 41 home runs tied with Ben Oglivie of the Milwaukee Brewers for the American League lead. However, the Yankees were swept in the ALCS by the Kansas City Royals. As he entered the last year of his Yankee contract in 1981, Jackson endured several difficulties from George Steinbrenner. After the owner consulted Jackson about signing then-free agent Dave Winfield, Jackson expected Steinbrenner to work out a new contract for him as well. Steinbrenner never did (some say never intending to) and Jackson played the season as a free agent. Jackson started slowly with the bat, and when the 1981 Major League Baseball strike began, Steinbrenner invoked a clause in Jackson's contract forcing him to take a complete physical examination. Jackson was outraged and blasted Steinbrenner in the media. When the season resumed, Jackson's hitting improved, partly to show Steinbrenner he wasn't finished as a player. He hit a long home run into the upper deck in Game Five of the strike-forced 1981 American League Division Series with the Brewers, and the Yankees went on to win the pennant again. However, Jackson injured himself running the bases in Game Two of the 1981 ALCS and missed the first two games of the World Series, both of which the Yankees won. Jackson was medically cleared to play Game Three, but manager Bob Lemon refused to start him or even play him, allegedly acting under orders from Steinbrenner. The Yankees lost that game and Jackson played the remainder of the series, hitting a home run in Game Four. However, they lost the last three games and the World Series to the Dodgers. Jackson had faced the Dodgers four straight times in the World Series by 1981. No other player in Major League history has played against the same team more consecutive times in the Fall Classic.

Answer the following question by taking a quote from the article: What kind of difficulties?
Jackson expected Steinbrenner to work out a new contract for him as well. Steinbrenner never did