Speaking to Betway, Seaman said: "I don’t like seeing Bukayo Saka playing at left-back. If I was the opposition, he would be my main target because he’s not a defender. If he starts at left-back, that gives teams a chance to really put him under pressure, and any decent coach will do that.
"Maybe he could play on the left side of midfield, but not at left-back because we need a defender there. The other question is whether you risk Luke Shaw in a quarter-final, because he hasn’t played in such a long time.
"I don’t see why Trippier has to change, unless it’s through injury. The back four has not really been the problem, and it’s not like the opposition have been getting down our left side. It was happening more against Kyle Walker on the other side.
"Marc Guehi is now suspended for the quarter-final and is also dealing with a shoulder injury. I think he has been really impressive, especially with how he reacted after receiving the booking that ruled him out.
"Ezri Konsa came on as a substitute against Slovakia, which shows who Gareth trusts in that position. I would imagine that will probably be the only difference with the team when we play Switzerland.
"Hopefully Konsa will be as effective as Guehi has been, and at least he’s now had some game time, so it won’t be brand new to him. It’s not a worry to me at all."