Celtic were beaten 2-0 by Inter Milan in an ill-tempered friendly match at the Aviva Stadium in Dublin.
Luc Castaignos gave the Nerazzurri an early lead in the Dublin Super Cup encounter with a well-taken goal and Giampaolo Pazzini added the Italian side's second moments after they had Thiago Motta sent off.
Neil Lennon's team, who actually began their Clydesdale Bank Premier League campaign last weekend, were unable to find a way past goalkeeper Luca Castellazzi when they did manage to break down the Inter defence.
Inter claimed the lead in the seventh minute as Goran Pandev played a one-two before slotting a pass through to Dutch forward Castaignos, who gave Celtic goalkeeper Lukasz Zaluska no chance at his near post.
The temperature rose even higher in a tetchy friendly when Motta was sent off for a challenge on Brown, although the 10 men extended their lead seconds later.
A ball over the top caught out the Celtic defence and Pazzini got to the ball before Zaluska to prod it home right at the end of the first half.
In the day's earlier match, Manchester City beat an Airtricity XI 3-0 with Shaun Wright-Phillips and Adam Johnson the most impressive performers for the Blues.
Wright-Phillips gave Roberto Mancini's men the lead eight minutes into the second period as he latched on to a chip over the Irish defence by Gareth Barry.
Johnson applied a similarly cool finish when City's summer signing Stefan Savic played the ball over the top and trialist Luca Scapuzzi sealed the win late on.
Celtic will take on the Airtricity XI on Sunday while Inter face City next.
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