Ivanov earned 16 appearances in the Lega Pro Prima Divisione and kept five clean sheets during the season.
In June 2011 he returned to Siena as fourth choice[3] behind Željko Brkić, Gianluca Pegolo and Simone Farelli.
[5] After his contract with Siena expired in June 2012, Ivanov joined Botev Vratsa on a free transfer on 30 August.
[10] After a long absence from the starting lineup, on 11 May 2015, Mihail Ivanov played 90 minutes during the 0–1 loss from Litex Lovech.
He was an unused substitute over the course of the first match and earned his first cap on 4 June 2013, coming on as a replacement for Plamen Iliev during the second half of a 2:1 win.