Sakho played under current Sunderland manager Sam Allardyce at West Ham during the 2014-15 season.
The 26-year-old striker scored 10 goals and created 23 chances in 23 Premier League appearances for the Hammers during the 2014-15 campaign.
The former Metz man scored five goals and created 14 chances in 21 league matches for the London outfit this past season.
Sunderland fans have taken to Twitter to have their say on the prospect of the club signing Sakho.
Below are some of the best comments:
Eleven million one quid bits seems like a lot of one quid bits to spend on Sakho. I like him, don't get me wrong. Just seems a lot #SAFC— Andy (@easygoingmaloy) June 3, 2016
Sakho scores goals n you have to pay for goals, bony n Benteke weren't really firing when they were playing so in Sam I trust #SAFC— Michael Airey (@airey87) June 3, 2016
Reports of Bony leaving City for £16m. I'd rather pay the extra and get a much better forward than Sakho #safc— Parkersafc (@Parkersafc) June 3, 2016
Would be extremely happy with the signing of Sakho mind! Expected him to be involved in our business but not formal bid! #safc— Nathan Ullah (@NUllah21) June 3, 2016
The fact WH fans don't want Sakho to leave tells you everything you need to know#safc#whufc— Chris (@ChrisHa46657530) June 3, 2016
Get ready for the YouTube best skills and goals for Sakho hahahha lets hope he's got over Injury problems #SAFC— Lewis Greaves (@LewisGreaves1) June 3, 2016