Victory over Ross County, combined with a draw in the match between Motherwell and Inverness, would allow Saints to pull level on points with Caley Thistle in the coveted runners-up position. But, with a tough seven days ahead, including a meeting with SPL leaders Celtic, Lomas is taking nothing for granted.
He said: "We would like to get top six again. We had a taste of it last year so we would like to get there again. It's very tight and we`ve got a very big week, Ross County away, Celtic at home and St Mirren at home. Ross County are probably one of the form teams and so are St Mirren. Playing Celtic in-between is going to be tough."
Lomas added: "We are under no illusions that we are probably going to have to win at least another three or four games to get into that top six. The old cliche comes in that you are only looking at one game.
"We've got three games in seven days, which will stretch us and everybody in the squad will have to play a part. We're not really focusing past that."
St Johnstone make the trip to Dingwall boosted by an impressive 3-1 win over Hibernian at Easter Road on Monday night.
Lomas said: "Confidence should be high, it was a good performance. But it's gone now, it's put to bed, and we'll have to try to repeat it now. I don't think Ross County have been beaten since the turn of the year.
"They are a very efficient side and the manager has brought in four or five very good signings, he`s probably been the busiest of the managers in the SPL. All credit to them, they are a decent, well-organised team."
Ross County look set to comfortably survive their first season in the top flight and Lomas has been impressed by the SPL newcomers so far this term. He said: "They are very organised, very workman-like, with a very good team spirit about them.
"They have good quality as well, which isn`t a bad combination. It`s never an easy place to go to. All credit to them, they`ve bedded themselves right in there and it's going to be a tough game."