Loretta, 48, just completed his first season with the organization after previously working in the Padres' front office.
Venable, 36, had been the Cubs' first-base coach for the past two seasons. He initially joined the organization in September 2017 as a special assistant to the president/general manager.
Ross, 42, is the most high-profile candidate of the three. He played for the Cubs for two seasons and helped them break through to win the World Series in 2016. Ross is believed to be the front-runner for the job, should he want it. He has already publicly expressed interest in the position.
At a season-ending press conference Monday, president of baseball operations Theo Epstein weighed in on Ross' candidacy, explaining his role on the championship will carry no weight -- positively or negatively -- in the team's decision on him.
"He's going to be evaluated on the merits," Epstein said.
"We're looking forward, we're not looking backwards."