Pulisic will be out for a few weeks and misses out on the home game against Burnley this weekend.
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“Before Christmas he did report a bit of tiredness so he came out of the team and I was worried about him picking up an injury.
“He was in pain when it happened. He’s a good player that provides competition in wide areas and can make things happen. He was in good form for a period.
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Pulisic scored a hat-trick against Burnley earlier in the season, following a lack of first team football when he first arrived at Stamford Bridge last summer. Dailypost