This as the two head towards a likely showdown at the Rio de Janeiro Summer Games next year.
Gatlin, who has twice served bans for doping, was unbeaten at 100 and 200 metres in 2015 until he faced an out-of-form Bolt at the IAAF World Championships in Beijing last month.
However Bolt won the 100 metre final in 9.79 seconds, just 0.01 of a second ahead of Gatlin, before securing gold in the 200 metres in more convincing fashion 19.55.
Gatlin has agreed to run the 200 metres as well as the shorter sprint at the diamond league meet in Brussels tomorrow after Bolt pulled out citing a need to recharge before preparing for Rio.
Gatlin said he had no thoughts of retirement and expressed a desire to keep going while he continues to be his country’s top sprinter.