Howe's comments came after the Sun reported that Arsene Wenger had "told Wilshere he is playing for his Arsenal future in a tense phone call" after sanctioning his Bournemouth switch.
It said Wilshere was left "in no doubt that his move must work out if he is to revive his career at the Emirates."
Griezmann future depends on Simeone
Could Antoine Griezmann be heading for Manchester United next summer? Well, it seems that any chance of the France international arriving at Old Trafford depends on one man.
Reports on Saturday indicated that United want to make Atletico Madrid attacker Griezmann their next superstar signing, but the 25-year-old has told Telefoot that what happens to him will be down to what happens to Diego Simeone.
The Manchester Evening News reports him as saying: "The only doubt [about the future at Atletico] would be if Simeone leaves.
"I called him before I extended my contract, and he confirmed to me that he was staying. I can learn a lot from him -- I'm happy in Spain.