Jose Mourinho started out his latest Champions League campaign as he finished the last one - a winner - as his new club Chelsea thrashed French strugglers Paris Saint Germain 3-0 in their opening clash of the tournament.His former club FC Porto did not enjoy a winning start as the drain of their best players during the summer took its toll and they could only eke out a 0-0 draw at home to Cska Moscow.However, the man he replaced as Chelsea boss, Claudio Ranieri, did enjoy a winning start to his campaign as Valencia eased to a 2-0 success over Anderlecht, the Belgian side continuing their dreadful away run in European competition which has seen them win just once in 18 trips abroad.While Ranieri will have to wait till the knockout stages to meet his own club, provided both go through their groups, there was no such wait for Henrik Larsson as he came off the bench for Barcelona to put his old team Celtic to the sword scoring the last in the 3-1 victory.The other British side in action yesterday, Arsenal, scraped an unconvincing 1-0 win over Dutch side PSV Eindhoven through an own goal by Alex.Both the Milan clubs enjoyed victories, though AC Milan had a tougher fight than they probably envisaged against Ukrainian outfit Shakhtar Donetsk before a late Clarence Seedorf goal gave them a 1-0 victory in Donetsk.Inter were scarcely more convincing as they beat Werder Bremen 2-0 thanks to a double by Brazilian striker Adriano, though the Germans were down to 10-men for the majority of the match.Chelsea, though, looked a different side under the auspices of Mourinho than they had last year with Ranieri in charge and once they went in front thanks to John Terry’s header just before the half hour mark there was no stopping them against a side without a win this season.Didier Drogba’s strikes - one apiece in each half - made a nonsense of PSG coach Vahid Halilhodzic’s refusal to have a specific plan to stop the Ivory Coast star and left PSG without a win this season. Drogba added his two to the opener from Terry’s which was helped hugely by a blunder from PSG goalkeeper Lionel Letizi, who charged out to try and gather a corner but missed it completely. “The goals are a bonus for me as it gives me confidence for the matches coming up but the result was more important,” said Drogba, who signed from UEFA Cup finalists Marseille in the summer.