Celtic boss Neil Lennon has refused to name his transfer targets but confirmed he is looking to strengthen his team.
Fulham's Aaron Hughes insists Dimitar Berbatov must remain at Craven Cottage if they are to avoid relegation.
Suarez was signed from Celta Vigo in May 2011, but only made two appearances for City during his time at the club.
The 19-year-old made was a regular for City's elite development squad and made his first-team debut when he came off the bench in a League Cup victory over Wolves in October 2011.
His only other appearance for City was in the 4-2 defeat to Aston Villa in the same competition last season.