Chelsea head coach Frank Lampard was delighted with Christian Pulisic’s performance after he starred in a 5-3 friendly win over Salzburg on Wednesday.Pulisic was signed by Chelsea in January, but loaned back to Borussia Dortmund to conclude the second half of the Bundesliga season.He’s the lone truly new face brought into the club this summer as the club is currently serving a transfer ban that has prevented summer signings under new manager Frank Lampard. Article continues below Editors’ Picks Emery out of jail – for now – as brilliant Pepe papers over Arsenal’s cracks What is Manchester United’s ownership situation and how would Kevin Glazer’s sale of shares affect the club? Ox-rated! Dream night in Genk for Liverpool ace after injury nightmare Messi a man for all Champions League seasons – but will this really be Barcelona’s? The U.S. men’s national team star was in scintillating form during the first half, scoring twice and winning a penalty that Ross Barkley converted.Pulisic’s pace and composure around goal particularly stood out and Lampard was encouraged by the former Borussia Dortmund man’s performance.”I was very impressed with the way that he took the goals,” Lampard said afterwards.”As a winger in the Premier League, he has to adapt to that league.”He is young but with huge potential and I am happy for him.” Pedro netted an audacious mid-air flick in the second half, while Michy Batshuayi scored after the break, too.But Salzburg scored three goals of their own after half-time and caused problems throughout the contest for a shaky-looking Chelsea defence.Lampard acknowledged his side’s defensive play was a concern less than a fortnight away from Chelsea’s first Premier League match of the season.”We want to concede zero goals, so it is a concern and we want to improve on it,” he added.”We will talk about it. We can’t afford to make those mistakes.”Chelsea conclude their pre-season fixtures against Borussia Monchengladbach on Saturday.