Negotiations between the Philadelphia Phillies and Bryce Harper could be resolved by Tuesday, sources told ESPN's Buster Olney.

The Phillies remain confident that they are going to sign Harper, but sources told Olney that the sides are nearing a crossroads in their negotiations.

If the Phillies close out a deal with Harper, it would conclude an offseason in which Philadelphia landed two All-Star outfielders in Harper and Andrew McCutchen, All-Star reliever David Robertson and J.T. Realmuto, who is widely considered the best catcher in baseball.

Phillies managing general partner John Middleton flew to Las Vegas for meetings with the Harper camp on Friday, sources previously confirmed to ESPN's Jeff Passan. Those discussions continued into Saturday before Middleton departed.

NBC Sports Philadelphia was first to report that a representative from the Phillies was in Las Vegas on Friday.

The Phillies also met with Harper in January in Las Vegas. Other teams known to have met with Harper this winter include the San Francisco Giants, Chicago White Sox, San Diego Padres, Los Angeles Dodgers and Washington Nationals, with whom Harper spent the first seven seasons of his career.

Harper, 26, is looking for a deal in excess of the 10-year, $300 million contract the Nationals reportedly offered him at the end of the regular season. The left-handed-hitting outfielder batted only .249 in 2018 but had 34 home runs and 100 RBIs and came on strong after the All-Star break.

The Phillies ranked 11th in the National League in runs scored last season, and their right-handed-heavy lineup could use a lefty power hitter.