“Boston Red Sox Owner Fenway Sports Group and RedBird Capital that partner closely with LeBron James are seriously considering bidding for the Celtics, sources close to the situation said. James, who still stars for the Lakers, could not be a part of Celtics ownership now, sources said. But with the sale being a two-step process — where 49 percent of the team isn’t sold until 2028 — he could easily still end up being an owner of the Lakers’ hated rivals as the 39-year-old should be retired by that time