Former Liverpool striker Stan Collymore has criticised Arsenal manager Arsene Wenger over his transfer policy.

Collymore believes that Wenger lacks the ruthlessness of Manchester United manager Jose Mourinho after the Portuguese already made his presence felt in the current transfer market with his signing of Zlatan Ibrahimovic and pursuit of Paul Pogba.

"But I still don't feel Mesut Ozil, Alexis Sanchez or Granit Xhaka are of the highest level," Collymore writes in his column for the Sunday Mirror.

"They're very good players. Xhaka is the right type of signing, mobile and aggressive.

"But his arrival didn't light up the eyes of Arsenal fans in the same way that Zlatan Ibrahimovic's did with Manchester United's, or Paul Pogba's will do, if his deal gets done.

"Wenger could have done it with Luis Suarez, the Uruguayan could be banging in goals for Arsenal now rather than Barcelona.

"Of course, Pogba isn't worth £100m, but the statement that signing would make to the world from United and Jose is, 'This is how serious we are'.

"Yet, Wenger and his Arsenal paymasters don't seem to possess that ruthless streak.

"We know he has money to spend, but he is unwilling to take risks.

"He would take it as a personal insult if he let a player leave for nothing then three or four years later Arsenal were paying £100m to sign him back."