Nick Wass/Associated Press

One possible reason Bryce Harper remains a free agent is because of his reluctance to join a team he's frequently been linked to this offseason.

Per SNY's Andy Martino, Harper is "unsure" about signing with the Philadelphia Phillies.

Harper is now the biggest free-agent domino left to fall after ESPN's Jeff Passan reported Tuesday that Manny Machado agreed to a deal with the San Diego Padres.

This isn't the first time reports of Harper's uncertainty about Philadelphia have come up.

Joel Sherman of the New York Post reported in December that Harper wasn't "particularly" fond of the City of Brotherly Love.

The Phillies have gotten more aggressive in their pursuit of Harper recently. Per Jon Heyman of MLB Network, the Phillies are viewed as the favorites for the 2015 National League MVP, but he has "multiple" offers on the table worth more than $30 million per season. Mark Feinsand of MLB.com reported Machado's deal is for 10 years and $300 million which could set the standard for any Harper deal.

Philadelphia could certainly use Harper's bat in right field as it chases a playoff berth in 2019. Phillies right fielders hit a collective .225/.318/.374 with 20 homers and 71 RBI last season.

Harper hit .249/.393/.496 with 34 homers and 100 RBI for the Washington Nationals in 2018.