Per ESPN's Chris Forsberg, Thomas said: "He's excited. I mean, he obviously doesn't know where he's going, but ... he's excited about the opportunity. He asks questions; I answer them. He's a good friend of mine. If it happens, we'll figure out how to play together. If not, we'll go from there."
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The Celtics are in a unique position of owning the No. 1 pick and playing in the Eastern Conference Finals. Their front office also has to decide what to do with their roster if they draft Fultz, who played point guard primarily at Washington.
Thomas was named to the All-NBA second team this year and is an MVP candidate.
B/R's Jonathan Wasserman has the Celtics taking Fultz first overall in his latest mock draft, noting the Washington product has the "size, length and shooting range" to play either guard position.
It's a good situation to be in for the Celtics, who went 53-29 during the regular season and locked up the No. 1 seed in the East.