LONDON After a step backward in Tom Browning Jersey his rehab, Kodai Senga could be returning to a bullpen mound within the next few days. The right-hander has been progre sing in his long-to s se sions, according to pitching coach Jeremy Hefner, and plans to throw a bullpen Monday or Tuesday. Hefner described Senga as trending in a positive direction. Senga had that canceled a bullpen se sion and later received a cortisone shot. There was thought earlier last month that Senga was close to beginning a minor league rehab a signment, but Senga applied the brakes, saying he first wanted to work on his mechanics before progre sing to games. Mets Kodai Senga warms up with a volleyball when the New York Mets played the Arizona Diamondbacks. Robert Sabo for NY Post Once Senga throws a bullpen se sion, he likely will still need to face hitters in a controlled setting before hes considered for a rehab a signment. Senga was shut down early in spring training with a right shoulder strain and the Mets were initially hopeful he would be ready for a return by early June. At this point, the Mets could be looking at the All-Star break as a best-case. Explore More Francisco Alvarez was scheduled to return home to Venezuela for a family matter, according to manager Carlos Mendoza, and likely will need extra days before he completes his rehab a signment and is activated. Alvarez was initially on course to rejoin the Mets at the beginning of their next homestand Tuesday. Alvarez is returning from surgery to repair a torn ligament in his left thumb. Edwin Diaz felt good following a rehab outing Thursday, according to Mendoza, and is scheduled to pitch Sunday for High-A Brooklyn. Delivering insights on all things Amazins Sign up for Inside the Mets by Mike Puma, exclusively on Sports+ Thank you By clicking above you agree to the and . Enjoy this Post Sports+ exclusive newsletter! The right-hander, who has been sidelined with a right shoulder impingement, could potentially be activated from the injured list Tuesday. Infield prospect Jett Williams underwent a right wrist TFCC debridement procedure Thursday in Scottsdale, Ariz., the Mets announced. Jett Williams takes batting practice before a game against the Houston Astros during Spring Training. Corey Sipkin for the NY POST A typical return to game activity following such a procedure, according to the team, is 8-10 weeks. Williams was the organizations minor league player of the year last season. Jose Rijo Jersey