Apparently, it was more than the Cavs and Clippers (and BOS) that had an interest in TT.
Evan Dammarrell of Forbes recently reported that Toronto was a potential suitor for Thompson:
“Thompson does have interested suitors on the market – mainly the Los Angeles Lakers, the Los Angeles Clippers and the Toronto Raptors, according to league sources.”
Chris Mannix of SI
"The Lakers would love to land Tristan Thompson, an ex-LeBron James teammate in Cleveland who would shore up the front line. The Raptors, who could lose both Marc Gasol and Serge Ibaka, are expected to pursue the Toronto-born big man."