American League President Lee MacPhail is expected to announce Thursday his decision on the controversy surrounding George Brett's pine-tarred bat.

MacPhail, who arrived in New York from Florida yesterday morning, examined the bat, read reports from specialists in the rules, crew chief Joe Brinkman's report, and a long objection by the Kansas City Royals.

"We will probably have an announcement on Thursday," said Robert Fishel, assistant to MacPhail. "He (MacPhail) has been checking into this all day. He has read several reports already."

Brett hit a two-out, two-run home run in the ninth inning in New York Sunday that gave the Royals a 5-4 lead over the Yankees. However, after Yankees Manager Billy Martin protested that Brett's bat had pine tar more than 18 inches from the knob, the umpires nullified the home run, called Brett out and the Yankees won the game, 4-3.

Rule 6.06 states: "A batter is out for illegal action when (a) he hits an illegally batted ball."

Rule 2.00 states that "an illegally batted ball ishit with a bat which does not conform to Rule 1.10."

Rule 1.10(b) states: "The bat handle, for not more than 18 inches from the end, may be covereded with any material (including pine tar) to improve the grip. Any such material, including pine tar, which extends past the 18-inch limitatin the umpire's judgment, shall cause the bat to be removed from the game. No such material shall improve the nce factor of the bat."