Drummond's arrival in LA is the latest development in the NBA's annual super-team agglomerations around the trade deadline.
Marc Gasol and fellow newcomer Montrezl Harrell are likely to replace McGee and Dwight Howard as the big men in the Lakers' rotation.
NBA: Kyle Lowry agrees to $31 million one-year contract extension with reigning champions Toronto Raptors, according to reports
Keeping Lowry solidifies the core roster for the defending NBA champions, who lost NBA Finals Most Valuable Player Kawhi Leonard to the Los Angeles Clippers in a major setback to their repeat hopes
FIBA World Cup 2019: Marc Gasol completes historic double as Spain beat Argentina 95-75 to win second title
Spain's Marc Gasol is also the 19th to win either an NBA or WNBA crown along with a gold medal, either of the Olympic or World Cup variety, in the same year.
FIBA World Cup 2019 final: Marc Gasol on verge of rare double as Spain, Argentina fight out for second title
Spain's Marc Gasol, who played a key role in the Toronto Raptors' run to the NBA title, is on the verge of becoming only the second player to win NBA title and World Cup in a same year.
FIBA World Cup 2019: Marc Gasol powers Spain into final after double overtime victory; Argentina beat France
Spain will face either France — quarter-final winners over reigning two-time champions the United States — or Argentina in Sunday's decider in Beijing.
FIBA World Cup 2019: Hernangomez brothers Willy and Juancho propel Spain to semi-finals with win over Poland
Charlotte Hornets centre Willy Hernangomez drilled 18 points and brother Juancho, the Denver Nuggets forward, scored 14 in a 90-78 quarter-final win for Spain over Poland on Tuesday.
NBA: Spanish Toronto Raptors star Marc Gasol calls for 'shared solution' to aid migrants journeying through Mediterranean
34-year-old Gasol, NBA champion with the Toronto Raptors and representing Spain in the current World Cup, did not blame any country or politician, but Italy and Malta have consistently refused to allow civilian rescue vessels to dock
NBA: Marc Gasol exercises $25.6 million one-season contract option to stay with champions Toronto Raptors
Spanish center Marc Gasol has exercised his $25.6 million one-season contract option to return to the NBA champion Toronto Raptors next season, the Canadian club announced
NBA: Understated Kawhi Leonard taps into inner-Michael Jordan to lead Toronto Raptors to historic championship
A masterful playoff run from Kawhi Leonard has elevated him to legendary greatness and taken the Toronto Raptors to their first-ever NBA title.
NBA Finals 2019: Raptors' Marc Gasol should have been awarded two free throws late in Game 5 against Warriors, says league
The NBA says Toronto's Marc Gasol should have been given two free throws with 49 seconds left of Game 5 of the NBA Finals.
NBA Finals: Defending champions Golden State Warriors unworried by defeat to Toronto Raptors, planning adjustments to style of play
Count on the Golden State Warriors, who had won 12 prior playoff openers, to bounce back as they fight for a third consecutive NBA crown and fourth in five seasons
NBA Finals 2019: Pascal Siakam, Kawhi Leonard guide Toronto Raptors to victory over Golden State Warriors in Game 1
Toronto forward Pascal Siakam scored 32 points and the Raptors defeated the defending champion Golden State Warriors in the opening game of the NBA Finals.
NBA Playoffs 2019: Toronto Raptors turn in team performance to thump Milwaukee Bucks and level Eastern Conference finals
The Toronto Raptors closed ranks around hurting star Kawhi Leonard, to beat the Milwaukee Bucks and level the NBA Eastern Conference finals.
NBA Playoffs 2019: Kawhi Leonard leads Toronto Raptors to gritty overtime win over Milwaukee Bucks in Game 3
Kawhi Leonard scored eight of his 36 points in the second overtime period to lead the Toronto Raptors to a gritty 118-112 victory over the Milwaukee Bucks.
NBA Playoffs 2019: Giannis Antetokounmpo grabs 30 points in Milwaukee Bucks' Game 2 trouncing of Toronto Raptors
Giannis Antetokounmpo grabbed 30 points and 17 rebounds and the Milwaukee Bucks never trailed on the way to a 125-103 victory over the Toronto Raptors.
NBA Playoffs 2019: Raptors thrash 76ers to take 3-2 lead in series; Nuggets rout Trail Blazers to win Game 5
The Toronto Raptors dismantled the Philadelphia 76ers and the Denver Nuggets dominated the Portland Trail Blazers to take commanding leads in their NBA playoff series.
NBA: Jeremy Lin finalising contract buyout with Atlanta Hawks to sign for Toronto Raptors, claims report
Jeremy Lin, the first American of Chinese or Taiwan ancestry to play in the NBA, is finalizing a contract buyout with Atlanta to set up signing with Toronto
NBA: No deal for Pelicans star Anthony Davis as trade deadline expires; Marc Gasol and Markelle Fultz on the move
Marc Gasol and Markelle Fultz were reported to be on the move on Thursday as the NBA's trade deadline expired with no deal for New Orleans Pelicans star Anthony Davis.
Stephen Curry and Kevin Durant both were ejected with 43 seconds left on Saturday night, a fitting end to a frustrating night for Warriors in a 111-101 loss to Memphis.