The United States, Mexico and Canada will jointly host the 2026 World Cup.
Holders Chelsea made light of their off-pitch problems to reach the Champions League quarter-finals.
Pulisic suffered an ankle injury while playing for the United States during the international break last month.
Lampard said his team were finally finding the right balance between attack and defence after shutting out Burnley in Saturday’s 3-0 English Premier League.
The two players picked up injuries during Chelsea's 2_1 loss to Arsenal in FA Cup final and they were forced to leave the pitch.
Chelsea confirmed the signing of U.S. international winger Christian Pulisic from Borussia Dortmund on Wednesday, making the 20-year-old the most expensive American soccer player in history.
Christian Pulisic scored two goals leading USA national team to win over Trinindad and Tobago 2-0 in 2018 world cup qualifications in CONCACAF Gold Cup.