Giants linebacker J.T. Thomas tore ligaments in his left knee while covering a squib kickoff on the final play of the first half Sunday in Dallas, landing him on injured reserve.

The Giants probably will add another position player to take his place before Sunday’s game against the Saints — likely a linebacker or offensive lineman — but on Monday the corresponding roster move was activating kicker Josh Brown from his one-week suspension. McAdoo said Brown will kick Sunday, which likely means fellow kicker Randy Bullock will be released before the end of the week.

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Giant steps

McAdoo dismissed the idea that he had somehow outsmarted the Cowboys by forcing them to play with the setting sun in the eyes of their receivers in the fourth quarter of the game on Sunday. “Whether you’re looking into it or it’s at your back, it’s going to impact both sides of the ball,” he said. “If you’re a quarterback and it’s in your eyes, it’s better for the receivers that way but it’s tougher to read the coverage and vice versa.” It was such an issue, though, that Jerry Jones entertained the idea of putting up curtains or drapes at AT&T Stadium for future late afternoon games . . . Sunday’s 20-19 win over Dallas was the Giants’ first one-point win over anyone since they beat Denver, 24-23, on Oct. 23, 2005. It was their first one-point road win since they beat the Saints in New Orleans, 13-12, on Nov. 27, 1988. It was their first one-point win in a season-opening game since they beat the Eagles, 28-27, on Sept. 2, 1984. And it was their first one-point win over the Cowboys in their history. All of which is courtesy of Bullock missing an extra point in the second quarter.