Lakers Will Win NBA Title If Healthy

Lamar Odom is (maybe surprisingly) all for the Lakers signing Tristan Thompson ... in fact, the former NBA star tells TMZ Sports he believes the power forward can "100%" help them win an NBA title.

We caught up with the 43-year-old at LAX on Friday, just two days before his beloved Lakers face the Memphis Grizzlies in a best-of-7 playoff series.

Despite the Lakers making it into the playoffs with a play-in win against the Timberwolves, many doubt the team can actually go anywhere. There's also been a ton of doubt about why the organization signed Thompson, who hasn't played meaningful minutes in the league in over a year.

Those people haven't talked to Lamar ... who believes Tristan solidifies…