The Giants shored up their outfield mix with yesterday’s addition of Austin Jackson on a two-year, $6MM contract — threading the luxury tax needle by adding a veteran that serves as an upgrade while still squeezing in just south of the $197MM barrier. That doesn’t leave much room for further upgrades, but executive vice president of baseball ops Brian Sabean and GM Bobby Evans tell reporters that the Giants are still open to supplementing their outfield (links via Alex Pavlovic of NBC Sports Bay Area and John Shea of the San Francisco Chronicle). Notably, Sabean suggests that Jackson was “probably not” signed to be the team’s everyday center fielder. “I don’t know that in his recent history he’s been able to go out there in that fashion,” Sabean says of Jackson. San Francisco is still exploring some low-salary trade options, and prospect Steven Duggar remains a candidate to win the job (if not in Spring Training, certainly later in the season). Duggar, though, has just 232 minor league games under his belt, with only 60 of those coming in Double-A and just 13 in Triple-A. San Francisco remains confident in its ability to acquire an additional outfielder via trade, Pavlovic writes. That’ll likely require prying loose a pre-arbitration player making near the league minimum, as the Giants are now within about $2.1MM of the luxury threshold (per Cot’s Contracts).