Writing on his personal Twitter account, the former-Liverpool goalscorer said: “Good player Fellaini...but just not a Man United player.”
Fellaini was signed by David Moyes for £27.5m on deadline day – Manchester United’s only big-money capture of the summer window.
And Fowler is not the only former-Liverpool favourite to doubt United’s transfer business this summer. Jamie Carragher has expressed similar fears that Fellaini is not up to the required standard for an Old Trafford midfielder.
Fellaini was by no means United’s first-choice, with Moyes actively pursuing Cesc Fabregas and Ander Herrera at various points over the summer window.
But Moyes, who worked with Fellaini at Everton, ultimately plumped for the Belgium international with time running out on transfer deadline day.
Liverpool were also busy on the final day of the summer window, Brendan Rodgers bringing in two defenders – Mamadou Sakho from Paris St-Germain and Tiago Ilori from Sporting Lisbon.