Opener Andy Balbirnie anchored the Irish innings with 77 off 55 balls including 10 boundaries
AC Milan were held to a 0-0 draw at San Siro in a hard-fought contest by a Newcastle United side returning to the Champions League after a two-decade absence as the hosts spurned numerous opportunities in the Group F opener on Tuesday.
Milan's Portugal winger Rafael Leao, who has scored in his last two games, was a constant threat down the left and kept the Newcastle defence busy but was let down by his finishing.
"We’re disappointed, because when you play like this, you have to win," Milan manager Stefano Pioli said.
"The performance was all-round good, but we wanted to win. Our aim is to progress from this group and we wanted to start well. We didn't take easy chances."
Last year's Champions League semifinalists enjoyed a dominant opening spell and tested Newcastle goalkeeper Nick Pope with long-range efforts from Tommaso Pobega and Leao before Samuel Chukwueze had a header saved.
The best opportunity of the first half fell to Leao in the 34th minute but the 24-year-old miscued an elaborate backheel after skipping past two defenders in the penalty area.
Though Newcastle defended better after the break, Milan continued to press in their search for an opener.
Halftime substitute Alessandro Florenzi found Leao with an inch-perfect cross in the 74th minute, but the Portuguese again failed to find the target as he put his header over the bar.
Milan, who ended the night with a tally of 25 shots, were also dealt a double injury blow with midfielder Ruben Loftus-Cheek and keeper Mike Maignan having to be substituted.
At the other end of the pitch, the visitors' efforts were limited to counter-attacks.
Eddie Howe's team had one attempt on target, which came when Sean Longstaff forced substitute keeper Marco Sportiello into a save with a shot from the edge of the area in the 95th minute.
"It was emotional. We take this draw and point, a point we fought to get and we're happy about," said Newcastle midfielder Sandro Tonali, who left Milan in the close season.
But the draw could hurt both teams in a tough group featuring French champions Paris St Germain and 1997 European Cup winners Borussia Dortmund.
Milan next travel to Germany for a clash with Dortmund, while Newcastle host Kylian Mbappe's PSG at St James' Park.
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