diff --git a/lib/gitlab/import/source_user_mapper.rb b/lib/gitlab/import/source_user_mapper.rb
index d21b0c60895f11c1154020a2a9e8dc1c67eaf74c..59bd0add07025f1846760ae51ec91382b83eddc7 100644
--- a/lib/gitlab/import/source_user_mapper.rb
+++ b/lib/gitlab/import/source_user_mapper.rb
@@ -107,7 +107,7 @@ def create_source_user_mapping(source_name, source_username, source_user_identif
       end
 
       def create_placeholder_user(import_source_user)
-        return namespace_import_user if placeholder_user_limit_exceeded?
+        return namespace_import_user if placeholder_user_limit_exceeded? || namespace.user_namespace?
 
         Gitlab::Import::PlaceholderUserCreator.new(import_source_user).execute
       end
diff --git a/spec/lib/gitlab/github_import/importer/pull_requests/review_request_importer_spec.rb b/spec/lib/gitlab/github_import/importer/pull_requests/review_request_importer_spec.rb
index 4f71c6a68f9a33f97ca462f43cd194fac951138b..c449e1d2d8c4f32dbea74f0bee868058db3fd31c 100644
--- a/spec/lib/gitlab/github_import/importer/pull_requests/review_request_importer_spec.rb
+++ b/spec/lib/gitlab/github_import/importer/pull_requests/review_request_importer_spec.rb
@@ -5,7 +5,7 @@
 RSpec.describe Gitlab::GithubImport::Importer::PullRequests::ReviewRequestImporter, :clean_gitlab_redis_shared_state, feature_category: :importers do
   include Import::UserMappingHelper
 
-  let_it_be(:project) { create(:project, :with_import_url, :import_user_mapping_enabled) }
+  let_it_be(:project) { create(:project, :with_import_url, :import_user_mapping_enabled, :in_group) }
   let_it_be(:reviewer) { create(:user, username: 'alice') }
   let_it_be(:source_user) do
     create(
diff --git a/spec/lib/gitlab/import/source_user_mapper_spec.rb b/spec/lib/gitlab/import/source_user_mapper_spec.rb
index abbd6f71431868f6643d477764ef680ebb597e73..ac552ea3954df9632570bd3b61c5c8466461e5dc 100644
--- a/spec/lib/gitlab/import/source_user_mapper_spec.rb
+++ b/spec/lib/gitlab/import/source_user_mapper_spec.rb
@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe Gitlab::Import::SourceUserMapper, :request_store, feature_category: :importers do
-  let_it_be(:namespace) { create(:namespace) }
+  let_it_be(:namespace) { create(:group) }
   let_it_be(:import_type) { 'github' }
   let_it_be(:source_hostname) { 'https://github.com' }
 
@@ -200,6 +200,20 @@
       end
     end
 
+    context 'when namespace is a personal namespace' do
+      let_it_be(:namespace) { create(:namespace) }
+      let_it_be(:import_user) { create(:namespace_import_user, namespace: namespace).import_user }
+
+      it 'does not create any placeholder users and assigns the import user' do
+        expect { find_or_create_source_user }
+          .to change { Import::SourceUser.count }.by(1)
+
+        new_import_source_user = Import::SourceUser.last
+
+        expect(new_import_source_user.placeholder_user).to eq(import_user)
+      end
+    end
+
     context 'when ActiveRecord::RecordNotUnique exception is raised during the source user creation' do
       before do
         allow_next_instance_of(::Import::SourceUser) do |source_user|
diff --git a/spec/lib/gitlab/legacy_github_import/issue_formatter_spec.rb b/spec/lib/gitlab/legacy_github_import/issue_formatter_spec.rb
index cc61e6c07c7879714f329b03a8e54c0b43eb1fae..24a5317836e161500fb19e3c93ea860e009c0572 100644
--- a/spec/lib/gitlab/legacy_github_import/issue_formatter_spec.rb
+++ b/spec/lib/gitlab/legacy_github_import/issue_formatter_spec.rb
@@ -10,9 +10,8 @@
       :project,
       :with_import_url,
       :import_user_mapping_enabled,
-      import_type: ::Import::SOURCE_GITEA,
-      namespace: create(:namespace, path: 'octocat')
-    )
+      :in_group,
+      import_type: ::Import::SOURCE_GITEA)
   end
 
   let_it_be(:source_user_mapper) do
@@ -258,10 +257,9 @@
       create(
         :project,
         :with_import_url,
+        :in_group,
         :import_user_mapping_enabled,
-        import_type: ::Import::SOURCE_GITHUB,
-        namespace: create(:namespace, path: 'octocat-github')
-      )
+        import_type: ::Import::SOURCE_GITHUB)
     end
 
     let_it_be(:source_user_mapper) do
diff --git a/spec/lib/gitlab/legacy_github_import/pull_request_formatter_spec.rb b/spec/lib/gitlab/legacy_github_import/pull_request_formatter_spec.rb
index cdb983788039fadde922df8ba94132556e5bc685..e4cdf05c1466b0984b1d6bbdf418613ec056ad88 100644
--- a/spec/lib/gitlab/legacy_github_import/pull_request_formatter_spec.rb
+++ b/spec/lib/gitlab/legacy_github_import/pull_request_formatter_spec.rb
@@ -10,6 +10,7 @@
       :project,
       :repository,
       :with_import_url,
+      :in_group,
       :import_user_mapping_enabled,
       import_type: ::Import::SOURCE_GITEA
     )
@@ -351,6 +352,7 @@
         :project,
         :repository,
         :with_import_url,
+        :in_group,
         :import_user_mapping_enabled,
         import_type: ::Import::SOURCE_GITHUB
       )
diff --git a/spec/lib/gitlab/legacy_github_import/user_formatter_spec.rb b/spec/lib/gitlab/legacy_github_import/user_formatter_spec.rb
index 7f650cf8116696ee79a188c069a9ba1355e41f81..7f5306e58510f7751bf18050056929fce0c7fb03 100644
--- a/spec/lib/gitlab/legacy_github_import/user_formatter_spec.rb
+++ b/spec/lib/gitlab/legacy_github_import/user_formatter_spec.rb
@@ -5,7 +5,7 @@
 RSpec.describe Gitlab::LegacyGithubImport::UserFormatter, feature_category: :importers do
   include Import::GiteaHelper
 
-  let_it_be(:project) { create(:project, :import_user_mapping_enabled, import_type: 'gitea') }
+  let_it_be(:project) { create(:project, :import_user_mapping_enabled, :in_group, import_type: 'gitea') }
 
   let_it_be(:source_user_mapper) do
     Gitlab::Import::SourceUserMapper.new(