The 25-year-old wished the winger well after his move to Everton on Deadline Day.
The 28-year-old winger spent some of last season on loan at Goodison Park and the Toffees were able to prise him away from White Hart Lane on a permanent deal on Deadline Day.
But many Tottenham fans were surprised and disappointed that all the north London club gave Lennon in terms of a goodbye was the above tweet.
Walker's message to the new Everton winger was far warmer, as he thanked him for all the help he was given over the years.
Intriguingly, as of yet, the Spurs Twitter account is yet to retweet Walker's well-wishing message.
After the Everton move, there have been suggestions from some fans that Lennon must have done something wrong or fallen out with boss Mauricio Pochettino or someone else at the club.
If not, it does seem bizarre Tottenham wouldn't show more compassion to such a long-serving player. But it's a dog-eat-dog world in football and West Brom also proved on Deadline Day that showing compassion to players isn't necessarily a priority anymore.