The Boston Celtics are reluctant to trade significant assets for a player who will be a free agent in the offseason.

“This team is not in it for the short term,” one league source said.

The Celtics have been linked to Dwight Howard and Al Horford, but sources say a deal for either player is unlikely.

The Celtics have almost no interest in Howard, who is 30 and has been injury-plagued since 2012. Boston would have reservations about offering Howard a long-term deal.

But the Celtics do think highly of Al Horford, who could receive a five-year, $146 million deal from the Atlanta Hawks this offseason. The Celtics would be more likely to pursue Horford in free agency.