Semien is absent from the lineup for Tuesday's game against the Rays.
The Cubs recalled Ferguson from Triple-A Iowa on Tuesday.
The Mets recalled Ross from Triple-A Syracuse on Tuesday.
Tong will not be promoted from Triple-A Syracuse when rosters expand Tuesday, as Justin Hagenman (ribs) will be activated from the 60-day IL instead, Brian Murphy of MLB.com reports.
Vientos went 1-for-4 with a solo home run in Monday's 3-2 win over the Rays.
Senga struck out one and walked one in a scoreless ninth inning Monday against the Rays to secure his fifth save of the season.
Conforto went 1-for-1 with a three-run home run in Monday's 17-3 win over Milwaukee.
Hoerner went 1-for-3 with a solo home run and a walk in Monday's 17-3 win over the Brewers.
Stock (1-3) earned the win Monday against the Rays, allowing five hits while striking out four over 5.1 scoreless innings.
Holmes (6-6) earned the win Monday, allowing five hits and two walks over six scoreless innings against the Brewers. He struck out eight.
